I don't believe that to be correct. There cannot be a literal 1000 years after the last trump because after it sounds, there is time no longer. The last trump is the sounded by the seventh angel, upon which sounding, "the kingdoms of this world are become (the kingdoms) of our Lord, and of His Christ" and time exists no longer. At that sounding, and at that sounding alone, the resurrections occur. So, the "1000 years" is a symbolic timeframe that must take place only before the seventh angel sounds, not after it, as the below verses demonstrate. I will try to address your other comments later as time permits.
[1Co 15:52-54 KJV]
52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
53 For this corruptible must put on incorruption, and this mortal [must] put on immortality.
54 So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory.
[Rev 8:2 KJV] 2 And I saw the seven angels which stood before God; and to them were given seven trumpets.
[Rev 10:6-7 KJV]
6 And sware by him that liveth for ever and ever, who created heaven, and the things that therein are, and the earth, and the things that therein are, and the sea, and the things which are therein, that there should be time no longer:
7 But in the days of the voice of the seventh angel, when he shall begin to sound, the mystery of God should be finished, as he hath declared to his servants the prophets.
[Rev 11:15 KJV] 15 And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become [the kingdoms] of our Lord, and of his Christ; and he shall reign for ever and ever.