Hi my name is Mike, 75 years old. I have OA in my fingers and shoulder. I don't know if what I have problems with is trigger finger but my fingers are locked in the morning. I have found a unit "Theragun" a massage machine, on the lowest setting, although painful at first seems to loosen my fingers well. I have been using this method for 11 months with no side effects.
Only just found this post, hope it helps. Mike
ps. also use a computer a lot !