I think these are the variables, in some combination:
Resurrection Act allows the president to use military forces domestically
Martial Law would allow a military unit within the US to maintain order, solve various critical failures, and reestablish a working government. I think it's so bad that Trump will have to suspend the entire federal government except for SCOTUS. Even though SCOTUS is comped, certain justices could be arrested, and the states would need a judicial body to handle interstate or constitutional issues within the state.
14th Amendment basically sweeps up all of the traitors in one fell swoop.
20th Amendment codifies the inauguration. It ends the first term of Trump. It specifies who is inaugurated, in order: President-elect; Vice President-elect; Congress picks somebody with majority vote
25th Amendment comes into play if somebody is actually sworn in and then removed for whatever reason. Note that if Biden is sworn in then the only way to remove him would be to impeach him. He's basically immune from the Judicial and congress obviously wouldn't remove him. And Commander in Chief.
So, I think the order is:
Insurrection
Martial Law
Suspend the federal government and get it rebuilt
Have a new election
End the Martial Law once a president is sworn in
I'd love it if any anon can provide any feedback if any of this is wrong. This is just my own theory I've put together in the last few weeks and I'm not a lawfag, but I can read.