Down here in Australia we have one of particularly noteworthy repute, Gold Street Studios, based in the sleepy, small farming community in Trentham East, Victoria (Google map it), conveniently a few hundred metres from an historic pub, the Pig & Whistle, dating from the gold rush era. And yes, Ron, silver gelatin is also represented.
Principal Ellie Young guides participants through virtually every alternative process you have heard, and quite a few no doubt you have never heard of! It's a gem of a place and workshops are always in demand and fill quickly.
• Gold Street Studios