This is contingent on being able to move Taillon and most of his salary, which certainly isn't a slam dunk, but honestly I'd probably prefer Gallen if you can't get one of Bichette/Tucker/Bregman.
Gallen, Yoan Moncada, and your favorite reliever left on the market (Seranthony Dominguez or Ryne Stanek?) probably costs around $35M. If you can save at least like $12M in a Taillon trade that opens up that rotation spot and should allow you to do Tom/Jed's customary $10M under the tax move.
It's not my favorite outcome from here, but as backup plans go I like it a lot. That rotation wins a lot of games.