Perhaps a bit far-fetched, but Romney actually has a decent amount of leverage, if he and one of Collins, Murkowski, etc. threatened to become "Independent Republicans" or what have you who caucused with the Democrats.

That doesn't mean he'd ever in a million years vote with the Democrats on, say, taxes. But on basic good-governance stuff—letting Biden appoint a cabinet, protecting against future elections from being stolen—he would.

I don't *quite* get Democrats' cynicism on Romney, Collins and Murkowski. They're Republicans! They're often going to vote for conservative stuff! But Murk/Collins voted with Trump only ~1/2 the time in the last Congress. And Romney voted to impeach Trump! https://projects.fivethirtyeight.com/congress-trump-score/