Could Michigan and/or Wisconsin retroactively change the EV allocation to proportional or by CD prior to the meeting of the electors in December? Serious question, because I recall the Florida legislature threatening to assign their electors to Bush by legislative action if the recount didn't stop.
No. Retroactive changes in electoral law to favor one side after a prior election makes a mockery of the vote. Such would have thrown the 2000 election to Al Gore had it been done in Florida or in several states that Dubya clearly won.