Million dollar idea? How about a bridge that wraps around the tree as a lineman's belt does but with an extra wrap at height (around the tree) to cinch to the tree? (Of some sort/in a safe way)
I think it's time to experiment again.. That would greatly reduce hip pinch and still allow movement around the tree. BUT, as you rotate, the far side would get eaten up, thus turning your body away from the tree as in a lean out shot. Pro's and con's to everything.
Definitely going to try it at ground height to see how it works, maybe even pump out a YT vid?