When my Ted had a horrendous dental locally in the first lockdown and really messed up his mouth, Debbie took Ted in as a boarder as he had to have a conscious dental every two weeks after the mess that was made, previously it had been every 6 weeks. Perhaps you could board him and his companion if he has one there until he is back to eating for himself and stable, then he can come back home. We did this with Ted, he stayed for 3 months, it was a wrench but I knew he was in the best place for treatment when he needed it
At least if he is with Debbie he will get a dental on the Maddock’s return, appointments book up so fast, we used to book up to two months in advance
I don’t know where you live but the Cat and Rabbit has a Facebook site for people who travel long distance, you can meet people and share the travelling. We did this with a couple from Devon and would take it in turns, it was really helpful, put a feeler out to see if anyone else travels on your route