"What I would do is install inspection rings."

Please don't do that on an aileron. Nothing good will result.

Urethane finishes are very resistant to chemical strippers. And the chemicals do attack the poly fabric. And one characteristic of modern fabrics is that they do wick any thin liquids along the weave a long way. The manner of starting a repair advised by the paint manufacturers is to sand the urethane finish off, down to the primer. A drawback of the beautiful urethane finish systems.

The advice on putting what is called a "dollar patch" on the small hole needed to access the fastener, sanding the finish for an inch around that small hole, is the best approach. Cut the patch out with pinking shears.

Yes, I have done that exact repair.

Wes