I’d probably turn a tenon to fit the inside diameter of the opening. Pad it with a neoprene, mousepad or something else with a lot of friction (double sided tape might be an idea too). Then apply no more pressure with the tail stock and spin of the tenon carefully with a sharp gouge. Beautiful bowl by the way. I have a cherry blank waiting for Nakishima joinery too.
Any ideas on how to reverse chuck this bad boy?
Lathe moved to the barn