Dodge, your story reminds me of the jazz pianist, Dave Brubeck. As a young man he broke his neck in a diving accident. Fortunately he wasn't paralyzed but has lived many years with chronic pain and discomfort. He has to change his position quite frequently so he arranged to have pianos and keyboards at his house in all sorts of positions so he can sit at different heights or stand. He even had a keyboard suspended upside down so he could play while lying on his back. (Can't see how that would work for a smith though!)Of course having money helps! He can afford to do those things.
I'm truly amazed at what other cultures can do. In Japanese culture (as well as others) squatting and kneeling is so prevalent in everyday life. I don't know if they have problems with their knees long term, but they don't seem to. My American knees can't seem to handle it, though.