I was suggesting on another post the thin cotton gloves - can get on amazon and I think would work well with thumb/finger pickers. Put some lotion on and glove over it at night as well to help healing process.
Also I think I will link a couple little things that have been helping me a lot now.
The ring I have on my index finger and can spin it with my thumb and that spinner has a nice weight to it and spins super easy just holding between thumb and a finger - these are two that have been the most helpful so far as far as calm hand gadgets