I think we're eventually going to find out that:
Plan A: Pence refuses to accept electors from some states - AZ, PA, GA etc and those states' legislatures sign off on Trump electors or neither Biden or Trump reach 270.
Plan B: If Pence doesn't play ball, send the mob to the Capitol and have the secret service evacuate Pence. Certification is indefinitely delayed and martial law declared. If a few members of Congress are hurt or killed, oh well.
Pence may be the reason the US still exists today.