Sure. If you'd like to examine Scripture in depth on the matter, I would be happy to look at a broad scope of texts. Here's just a start:
“Now the promises were made to Abraham and to his offspring. It does not say, “And to offsprings,” referring to many, but referring to one, “And to your offspring,” who is Christ.” (Galatians 3:16, ESV)
This text makes it very clear in my mind that the "promise" God made to Abraham is directed specifically at Jesus alone. So this pretty much undoes most of your claims about God's promise to Israel through Abraham.
“For it is written that Abraham had two sons, one by a slave woman and one by a free woman. But the son of the slave was born according to the flesh, while the son of the free woman was born through promise. Now this may be interpreted allegorically: these women are two covenants. One is from Mount Sinai, bearing children for slavery; she is Hagar. Now Hagar is Mount Sinai in Arabia; she corresponds to the present Jerusalem, for she is in slavery with her children. But the Jerusalem above is free, and she is our mother.” (Galatians 4:22–26, ESV)
In my mind, this text also makes it clear that the New Covenant in Christ is the fulfillment of God's plans for Israel. Those who think the focus of God in the OT was national Israel and the Law need to revisit this text. Paul makes it abundantly clear that the promise of God belongs to those who are of the faith of Abraham. The flesh counts for nothing. As John the Baptist said, "Do not say to yourselves, we have Abraham as our father. From these stones God can raise up children for Abraham."
Also, I reject strongly your claim that I am taking Hebrews out of context. The purpose of "Hebrews" is to challenge Jewish Christians to remain true to their faith in Christ. In the midst of persecution and suffering, some Jewish believers were going back to Judaism and turning away from Christ. This is the focus of the entire letter. Thus, the point that Abraham was seeking a city whose builder was God has everything to do with the land and God's promises for his people. So you get a fuller sense of the context...
“These all died in faith, not having received the things promised, but having seen them and greeted them from afar, and having acknowledged that they were strangers and exiles on the earth. For people who speak thus make it clear that they are seeking a homeland. If they had been thinking of that land from which they had gone out, they would have had opportunity to return. But as it is, they desire a better country, that is, a heavenly one. Therefore God is not ashamed to be called their God, for he has prepared for them a city.” (Hebrews 11:13–16, ESV)
Tell me, what else could this mean other than God's promise to Abraham about the land. Abraham, who received the promise, lived in tents and did not own the land. His real focus was a homeland provided by God...a heavenly one...not an earthly one...as ours should be.
“At that time his voice shook the earth, but now he has promised, “Yet once more I will shake not only the earth but also the heavens.” This phrase, “Yet once more,” indicates the removal of things that are shaken—that is, things that have been made—in order that the things that cannot be shaken may remain. Therefore let us be grateful for receiving a kingdom that cannot be shaken, and thus let us offer to God acceptable worship, with reverence and awe, for our God is a consuming fire.” (Hebrews 12:26–29, ESV)
The notion that God has a separate plan for national Israel for a few brief years before the end of the world than what he has had for 2000 years since Christ's resurrection is a confounding idea to me. God does not have a separate plan for national Israel in the end times than what he had for them in the first century. Jesus is the plan and that plan is fulfilled. We are receiving a kingdom that cannot be shaken (remember this passage is directed to "Hebrews"). Its a heavenly kingdom. That was the focus of early Jewish Christians and I think we do violence to the Gospel if we teach that this is not God's plan for both Jews and Gentiles today.
“What if God, desiring to show his wrath and to make known his power, has endured with much patience vessels of wrath prepared for destruction, in order to make known the riches of his glory for vessels of mercy, which he has prepared beforehand for glory— even us whom he has called, not from the Jews only but also from the Gentiles? As indeed he says in Hosea, “Those who were not my people I will call ‘my people,’ and her who was not beloved I will call ‘beloved.’ ” “And in the very place where it was said to them, ‘You are not my people,’ there they will be called ‘sons of the living God.’ ” And Isaiah cries out concerning Israel: “Though the number of the sons of Israel be as the sand of the sea, only a remnant of them will be saved, for the Lord will carry out his sentence upon the earth fully and without delay.” And as Isaiah predicted, “If the Lord of hosts had not left us offspring, we would have been like Sodom and become like Gomorrah.”” (Romans 9:22–29, ESV)
Again, here Paul is showing that God's call and promises belong to both Jews and Gentiles. God will call those who are "not my people" (Gentiles in this context) his beloved and sons of the living God. And Israel, though as sand on the sea, will find that only a remnant is saved. Thus, Gods promises belong to a people of faith...and they are called his people and sons of the living God. Can you provide me with a text in the NT that says God has a separate plan to save national Israel and that they are his true "chosen people?"
On the contrary, 1 Peter (directed to Gentiles) speaks of believing Gentiles and the church in this way...
“But you are a chosen race, a royal priesthood, a holy nation, a people for his own possession, that you may proclaim the excellencies of him who called you out of darkness into his marvelous light. Once you were not a people, but now you are God’s people; once you had not received mercy, but now you have received mercy.” (1 Peter 2:9–10, ESV)
These OT phrases used specifically of national Israel are used by Peter (a Jew) toward believing Gentiles in the Church. "Chosen race, royal priesthood, holy nation, a people for his own possession."
Finally, time does not permit for me to go into how Jesus fulfills the shadow that was national Israel. God called his "son" out of Egypt....Jesus. He was in the desert 40 days (like the 40 years of Israel). However, he prevailed where Israel failed. Many OT texts that speak of Israel are used in the NT as being references to Christ because Christ is the "seed" and he is the true son. Thus, true Israel are those who are "in Christ." This true Israel has no distinction between Jew, or Greek, slave or free, male or female. If you are in Christ, you are true Israel and sons and daughters of Abraham. This is the mystery of the Gospel Paul was preaching and the reason why he was persecuted by other Jews.
“But it is not as though the word of God has failed. For not all who are descended from Israel belong to Israel, and not all are children of Abraham because they are his offspring, but “Through Isaac shall your offspring be named.” This means that it is not the children of the flesh who are the children of God, but the children of the promise are counted as offspring.” (Romans 9:6–8, ESV)
In my opinion, those who are fixated on natural lands and national peoples are unraveling the power of the Gospel and the reality of who Jesus is and what he accomplished. He demolished the dividing wall that kept Jews and Gentiles apart. Why are we now trying to rebuild those walls by claiming who "God's chosen people" really is or to whom the "promises of God" are really directed....a people born of the flesh of Abraham! Certainly not!
