I'm trying to think of a republican candidate that can appeal across the aisle. Pragmatically, the GOP will want to look at politicians from 3 states: Texas, Florida, and Georgia. As these are swingy states they need to hold. Problem is, most of their worst candidates come from these states.
Cruz, Desantis, Noem are all dead in the water. They will never get enough votes without insane levels of voter suppression. Basically anyone who hugged Trump close, will not only fail to get votes, but will face massive opposition. You could run a ham sandwich against a Trumpy politician and win if it had the right flavor of mustard.
Romney is too much of a chameleon.
I think Chris Christie still has something of a long shot, as he might actually carry NJ. After our string of frankly awful governors, both he and Murphy have been pretty good when graded on that curve.