I often switch to ‘electric’ because of *Guitar players’ ‘Thumb tendonitis’ (??name??)
Cause it’s much easier on that ‘Thumb Squeeze’ to hold down strings. But, that never really goes away, that i Know of?
Point: I also have the same injury as you, from skiing fall, and after 20 years, useless physio (silly Machines)…..Your ‘Solution’ sounds like a ‘Winner’ to me. You’re just lessening the Outward Strain on the injured shoulder (says ‘i’?) by Not forcing it OUT another 6 inches, where it may be weaker? Will Definitely try that out, since my Strat and amp are now just ‘Decorations’ (to me?) “Guitar IS Guitar” … i like that one.