Will Falconer, DVM Moderator
Grooming should be pretty easy: mobile groomers are in most places, and they shouldn't even ask re: vaccines. If they do, you waive them off with "He's current," (which is true for anyone vaccinated earlier, right?).
More significant is getting him some helpful medical care, and that's where a homeopathic vet can best be employed. Nothing in conventional medicine cures chronic disease, as you likely know, but carefully prescribed constitutional homeopathy can. See my Recommended Resources page for a video by the AVH link on how to choose a good one, even long distance.
Refusing to take part in damaging medical practices doesn't mean you can't get curative help from vets. You just have to choose carefully who you hire.