I also don't know how likely this is, but I would love for Jean Smart to host. She's really having a career moment with Hacks and Mare of Easttown. Plus she's genuinely hilarious. I saw where she said on a talkshow that Kate sent her the "Murdur Durdur" parody of MoE. So she is obviously on good terms with the show or at least Kate. And they could do another Designing Women sketch with her.
For returning vets, I could see Sudeikis coming back to host with Ted Lasso doing so well and likely to win a slew of Emmys.
I know they wanted that Bo Burnham guy last season, so that's someone