I have removed many blind nuts and have never had to heat them. Just thread a screw part way in and give it a light tap.
That said I have to go with agexpert on this one. My showtime is probably one of the easiest planes to land that I have ever flown.
It is a case of six of one half dozen of the other. If you go to nylon your gear could pop off on a hard landing that it would have survived otherwise. Plus the possible damage to the wings, fuselage sides or tail feathers from your gear bouncing around the plane.
My opinion? leave the gear alone and avoid flying in weather conditions you can't handle.