But He. Is. Going. To. Try. You know that just as well as I do, which is why you aren't arguing with it...you're just stating that he's going to fail. And he might well. But this time, they'll have four years to prepare, and a president wielding the pardon power to ensure that any illegal actions are forgiven (Trump's already flatly stating his intent to do so).
You're saying that they cannot do it because there is no legal grounding for an attempt to overturn democracy, but the legal process was never something they were particularly fussy about (not surprising given, y'know, the overturning-democracy thing). John Eastman, the soon-to-be-disbarred White House lawyer who dreamed up the fake electors scheme, openly admitted to Pence that their scheme was illegal, and they proceeded with it anyway:
https://yahoo.com/news/even-coup-memo-author-told-173116680.html
Others within the White House have stated that Eastman welcomed the likelihood that this move would result in disorder in the streets, because it would allow Trump to invoke the Insurrection Act and institute martial law.
There doesn't need to be an enabling act or a constitutional amendment: plenty of democracies have falling back into autocracy via what amounted to auto-coups, because once one holds enough of the levers of power, it becomes much easier to get the other levers of power to fall into line.
He wants to do it. He'll have four years to prepare to do it, to put the right people in place to do it. And he's going to try to do it. And yeah, he might be so spectacularly incompetent that he fails, and his all-McDonald's diet might cause him to drop dead before that point. But he is absolutely a threat to democracy. He has proven that before, through word and deed, and if elected he will prove it again.