Although there isn't a process by which it could occur, what would happen after in this hypothetical scenario? Supposing Trump did actually win, half the country is going to feel absolutely cheated and the other half is going to feel betrayed and lied to and there is no satisfying recourse beyond impeachment.
As you said in your later post, it would completely gut any authority Biden and his cabinet has in the country and internationally. Absolutely no one is going to take America seriously as the "beacon of democracy" if their free and fair election was as dirty as any third world country's. If it was proven without a shadow of a doubt, it could actually destroy America in a worst case scenario.
Honestly at that point is it even worth it if Trump can't get in anyway? Makes me think that both parties would have a vested interest in making this go away rather than let it become a black spot in history. The best outcome would probably be to just acknowledge there was some fraud from malicious actors and draw up laws to make sure this cluster fuck doesn't happen again.