do you have any vets, even if not specialized, some times there are great vets that aren't exoctic specialist, i would looks for one that maybe that can at least do routine care of them, its better than nothing, any maybe you already did, i don't know, just a suggestion.
this is a great idea. i live on the isle of man and we don't have specialist exotics vet (not enough exotic pets!), however, there are two vets at my surgery who are very good with chinchillas and i always make a point of seeing one of them. it'd be worth giving a few surgeries a ring and see if they have experience. some vets see more chins than others and some have more interest in them than others. definitely worth a try!