There is an interesting question for Wisconsin in terms of who it would potentially want to play. (assuming they don’t barf up the game to the gophers, which might be a grand assumption)
More than anything, win volume is an issue at the moment. in theory, getting Minnesota a second time would be the best for that, though winning two in a row against the same team seems difficult. Ohio State would be better for the résumé by a lot, but also more difficult.
Basically, if the Badgers lose the next one or one of the next two, they are toast. If they win the next two and then lose, they are hoping for an exceptionally soft bubble. If they win the next three and then lose, they probably have a decent chance at the play-in.
(this all assumes that their net rating is not held against them, which it’s not supposed to be but sometimes it is)