The 70th week of Daniel 9:27 coincides with the seven years of Ezekiel 39::9 that follow the destruction of the Gog/Magog armies that attack on Israel. Ezekiel 38:8, Ezekiel 38:16, that chapter also is about the Gog/Magog attack is said in those verses to be timed for the latter days, latter years.
The abomination of desolation will be "set-up" as it says in Daniel 12:11. The 1290 days of Daniel 12:11 and the 1335 days of Daniel 12:12 both fit within the 7 years.
I do understand why you believe that. However Dan 12.11, for me, is a review of earlier information in the book of Daniel that details the Reign of Antiochus. Although the 1290 days and the 1335 days may fit within a 7 year period there is no indication in Revelation itself that there even is a 7 year period!
Eze 38.8,16 identifies an endtime event, but it is hardly certain that a 7 year period of Antichristian terror is taking place. No period of 7 years, attacking the saints, is even described. It is purely an invasion into Israel that is being described--not a world dictator who vents his wrath upon both Israel and the Church.
Eze 39.9 speaks of a period of 7 years, but it seems to follow the judgment to fall upon Gog. And if this was the Antichrist, then the 7 years would follow the current age, being a part of the Millennial Age. The 7 years are spent cleaning up after war--not during it.
Furthermore, Barton Payne in his Encyclopedia of Biblical Prophecy has pointed out that Antiochus 4 ruled for 1290 days (as opposed to mention of 1260 days in the book of Revelation). He thought perhaps the news of Antiochus' demise, travelling slowly in those days, took more days to reach the Jewish People--hence, the 1355 days.
I think Dan 12 is a review of not one but two different time periods, both of which astounded Daniel, making it appear that the Jewish People would be defeated. Dan 12.7 speaks of the endtime reign of Antichrist for 3.5 years. Dan 12.11 speaks of the reign of Antiochus 4 for 1290 days. Both entities were future in Daniel's time, and he wanted to know more about both events, which were mentioned earlier in his life.
There were, I believe, two "abominations of desolation" mentioned in the book of Daniel. The one you refer to in Dan 12.11 is also in Dan 11.31. Both refer to Antiochus' abominable acts which led to the desolation of many Jewish people. There is also a glimpse of this in Dan 8.
But in Dan 9.27 there is another, different AoD that refers, I believe, to the abominable Roman Army which desolated Jerusalem in the generation of Christ. Same AoD terminology, but different contexts. Perhaps these different events were meant to be compared?
In Luke 21 Jesus identified, it appears, the AoD as the Roman Army because in the same place in his Discourse the other Gospel authors used the term "Abomination of Desolation." Therefore, the AoD represented the Roman Army for the Gospel authors.