That Alexander technique looks absolutely fascinating. There is a teacher near me, I may look it up.
Since posting I've bought every type of mouse known to mankind. I think the left handed and eventually 50/50 technique with the center-ball trackball and/or the handle grip mouse is going to be the key in the long term, along with a strong focus on good posture, which is work b/c I tend to slouch back and kick my feet up.
I started PT and it's going great. For anyone in the Boston area who needs PT, I can't recommend Kennedy Bros. PT enough. I've been there on and off for over ten years for myriad injuries and they have always had me back on my feet (or whatever) within a few weeks. They work you VERY hard and MAKE you come back until you're cured (many PT places tell you to do it at home after, say, six weeks, b/c of insurance coverage issues - KBPT will NEVER send you home until your are better and they will NEVER hound you for money; they are GOOD people).
I've put in an order for the foot mouse thing - the one that pivots, not moves b/c lifting and moving the foot arounds seems like asking for trouble (foot RSI). The potential for workflow is amazing - given that both hands would be free to work my MCU while using feet for the mouse. Can't wait to try to use that foot mouse to insert an effect for the first time. I'll probably end up getting frustrated and drop-kicking the thing, but it's worth a shot.
Thanks again.