So the better solution is to ban, not lame-duck periods, but lame-duck pardons. Here's draft language that might do the trick:
The power to grant reprieves and pardons for offenses against the United States may not be exercised without a public proclamation of the same; nor may it be exercised from one month prior to the time of choosing the electors until the next presidential term begins, except to grant temporary reprieves extending no longer than the tenth day of such term.
Three important things about this draft. First, it bans
secret pardons: the voters can't judge pardons that they don't know about. Second, it creates a "blackout period" in which the President can't issue pardons or commutations, starting one month before election day and lasting until the start of the next term. Whether the President is on the ballot or not, voters would have time to decide what they think of a pardon and whether to withhold their votes for the President's party. And third, it creates an exception for temporary reprieves, letting the current President postpone punishments (especially capital ones) and letting the newly elected President, or the same one if reelected, decide whether to make those reprieves permanent.
Mike Rappaport, who's
discussed this issue
before, notes that right now might be the
right time for members of Congress to act. The issue is in the news now. President Biden isn't on the ballot anymore, and neither is Vice President Harris, so Democrats could endorse the amendment without facing any electoral penalty. And because the focus right now is on Biden, Republicans could endorse it as a criticism of the incumbent rather than of their own president-to-be.