That's great Dino. And, in a case of nice timing, there's a fingerstyle lesson post that's right now just below this thread, in which the poster/instructor has the thumb-inside technique. Not overly pronounced, but you can see his index if not middle finger as well interacting with the thumb. I know I'm obsessing but the combination of that post and your finding a way to keep your style while eliminating pain is a real encouragement for me...
