I don’t believe for one second that the armed forces or the duly elected Senators and the Congressmen would have allowed the election results to have been overthrown.
The election would not have been certified, and there are constitutional provisions for that event. One State, one vote, Republicans would have won. At what point and in what way do you think the military (still under Trump's Command) would have "gone rogue"? What power do you imagine congresscritters had, and what will to exercise it? (IIRC the new Congress had just been seated, with a Republican majority overall - I'm betting not one of them would have broken ranks, even if doing so would have made any difference.)
I think it would have been a protracted and bloody battle, but ultimately, democracy would have prevailed.
I think it would have been over by the early hours of 1/7. If people objected they would have been shot.
It mystifies me that you are not even taking seriously how close we came to living in Trumpistan.