Do you have an opinion on soda blasting? Like sand blasting but uses sodium carbonate (baking soda) instead of sand, a much softer, more gentle, material. It's not available everywhere, and requires some specialized equipment.
I had a few boats stripped like this in the past, and the gelcoat sure LOOKED good afterwards, but I did not have a long enough followup to see any long term effects.
Big Majors Spot, Bahamas