Never had it. For other hand issues on the bike, doing stuff to strengthen my grip seemed to help. I might think that if you are weight lifting and doing other stuff in the gym, then you might be getting enough hand exercise. Maybe not.
If you know a physical therapist or physiotherapist, they might have some ideas. Particularly since you have the trigger finger already and not giving that time to recover could cause some permanent issues.
Maybe someone that has a better medical knowledge will answer. I'm just winging it and can only say I've watched doctors on TV! <grin>