Here's a radical notion: IF (that's the caveat) the Democrats do shift horses - from Biden to Harris (and someone needs to explain why an incredibly accomplished Black woman suddenly doesn't stack up) then Joe Biden should step down NOW and make Kamala Harris the 47th POTUS.
1) This would allow Kamala to run as the incumbent president.
2) As the rules of being president are now changed - and they are for ALL presidents, not just Donald Trump - then the current Democratic POTUS (whoever it is) should take the fullest possible advantage of those powers in order to preserve democracy from authoritarian hijacking.
Make Kamala the imperial president conservatives hadn't anticipated putting into power. And the moment Kamala does become POTUS, her first act should be to shit-can Merrick Garland and put a prosecutor on the job who doesn't give a fuck about the political ramifications of prosecuting traitors.