I think the perfect fit is the Angels.
They need starting pitching. They have been "all in" for a couple years now and have very deep pockets. (Didn't anyone notice how they splurged for Anthony Rendon despite knowing their pitching was going to be a major obstacle in a title?)
And most important Trevor Bauer has expressed a strong desire to start more games, as if he was in a 4 man rotation, but he was also very clear that his extra starts not become a requirement of his teammates. So not an actual 4 man rotation. The one team where this fits perfectly is the Angels, as they have a part time SP in Shohei Ohtani who could benefit from giving up an occasional start to Bauer while allowing he rest of the rotation to stay on track. I am not suggesting Bauer take Ohtani's starts but rather he take extra ones and then Ohtani's off day could reset the pace for Bundy, Canning, Quintana and/or Heaney.
The injury history of a couple of those guys also makes their need for additional SP that much greater...