So about that accident. And helping others from our misfortunes. I injured the tendons on my hand a couple of years ago, and could not even play guitar. While researching possible treatments, well, first I happened to see a spot on the local news, and then found about this new treatment ECM (extra cellular matrix) which had grown back actual fingers. I contacted them, they said yes it could be used to restore tendons. I didn't follow through , however , with 2 years time and other therapies the tendons have healed. I hope I'm not offering unwelcome info, you've said that you've had a lot of things suggested which just never worked out, but here's a link if you're interested in reading more and I'll stop here since I've probably gone on too long about it;-) https://humanlimbregeneration.com/man-regrows-finger-tip-with-pigs-bladder