The fact the Senate won't bring this up for some vote because of some mythical schedule is such absolute horseshit. They've got places to sleep in the Capitol, they can work 7 days a week for the rest of the year to get shit done if they need to, and this is most definitely an obvious priority to codify. And if the Republicans throw a fit, let them leave the let the Democrats establish a quorum with like Collins and Murkowski to shove this through or whatever the hell you need to make it happen.
Fucking broken ass idiotic high chamber that can't even do basic votes by design is strangling this country to death day after day and Dems barely even acknowledge it and seem to think that the system that has fucked them over for the past 25 years is suddenly going to work better if they just keep at it. Fight like hell, drag the Republicans to the floor, don't fight like "respectable people" goddamnit. And if Manchin objects, fuck it, burn him at this point since you're unlikely to hold both chambers in a couple months anyway. Better to go for broke and fail in a way that looks like fighting, than just achieving nothing for the next 3 months anyway like is going to happen.