The problem is not with weight or straps, it's my right shoulder, and I'm right-handed. Just the position and movement of the 'modified' arm causes a great deal of pain. It's 95% ok when sitting down. It may, repeat may, settle in time.
I did not take the offered gig, I'm not about to subject myself to that level of torture. I am still hopeful of getting the jazz trio off the ground, and that's a seated gig by design. Just got to find that mythical pianist!
Edited to add: I do have the Kinsman stool, but it doesn't work for me, head-wise, in a rock band, where I want to be bopping about. Basically, bopping ist verboten! So I'd rather sit and be mellow.
😁