Dan 7:22 I believe shows us the beginning of the symbolic thousand years, because that is when the door to the Kingdom of God in heaven was open for all those who died in faith waiting for the Messiah/Christ to come and make atonement for sin and defeat death. Rev 20 depicts all those who came out of the graves after Christ's resurrection and ascended to heaven with Christ a spiritual body/living soul without human form.
I believe this is why John writes the martyred souls as having lived and reigned with Christ (past tense) a thousand years. A thousand years for living and reigning with Christ began with His first advent and will end when the seventh/last trumpet sounds.
Since you are on record that you agree, this then logically means Daniel 7:22 is when the millennium initially begins.
But guess what? Amil has the beginning of the millennium somewhere around the time of the resurrection of Christ or soon afterwards.
Guess what else? Daniel 7:21 has to precede Daniel 7:22. And that it is because of verse 22 that verse 21 comes to an end eventually. After all, we simply cannot ignore, thus disregard, the 'until' plainly written in verse 22. It clearly means verse 21 continues in that manner until the Ancient of days comes in order to put a stop to it once and for all. The first coming did not accomplish that by itself. It is the 2nd coming that fully accomplishes it.
Therefore, the context of verse 22 is the 2nd coming. And if meaning Revelation 20:4-6, it equally means the 2nd coming is the context of that as well. Otherwise, we end up with a contradiction. Daniel 7:22 = 2nd coming = Revelation 20:4-6. But Revelation 20:4-6 does not = the 2nd coming. And what a blatant contradiction that causes. Contradictions make nonsense out of the texts involved, not sense out of instead. And this is a perfect example of exactly that.
And the fact Amil places the beginning of the millennium 2000 years ago, and that Daniel 7:21 has to precede the beginning of the millennium, per a scenario that agrees Daniel 7:22 = Revelation 20:4-6, that means Amil is forced to place Daniel 7:21 before the time of the cross in order to not contradict the chronology of verse 21 and 22.
Except Amil doesn't place Daniel 7:21 before the time of the cross. But Amils, such as yourself, so maybe not all Amils, since not Amils might agree to begin with that Daniel 7:22 = Revelation 20:4-6, do gymnastics with the texts instead. So instead of placing verse 21 before the millennium per this scenario, where it logically fits to begin with, you place it somewhere else altogether.
Premil does not have this problem, not even remotely. If Premil places Daniel 7:21 before the millennium, it means Daniel 7:21 fits the end of this age exactly where it logically belongs. And that it is Christ's 2nd coming that puts an end to Daniel 7:21 once and for all.
If the millennium began 2000 years ago, and that Daniel 7:21 MUST logically precede the beginning of the millennium if Daniel 7:22 = Revelation 20:4-6, guess what else was not true 2000 years ago? That the 2nd coming happened. The same coming that puts an end to Daniel 7:21 once and for all.