LOVE the silver. My all-time favorite.
My vote is add the rubber strips. We just installed a NOS genuine Ruf Yellow Bird bumper on a 930, think it looks better with the black strips between fenders and bumper.
The heat won't melt the fiberglass, but very likely will warp it. Suggestions:
1. Bend a reinforcement bar to match the curvature of the rear valence, below the slits. Stainless is great, but even a piece of all-thread will work. Epoxy it in place. now this area won't warp, will hold his shape for years despite the heat.
2. Get a metal heat shield for the turbine housing. If you have a Garrett GT35R turbo, TurboKraft manufactures a stainless heat shield.
If you have a K27 or similar, get a rigid multi-layer metal heat shield, like in the photo below.
The flexible "turbo blankets" do not hold up, period. Tried all of them, all materials. Fail.
3. If heat is still an issue, ceramic coat it all with a true thermal barrier coating rated to 2,000F.
Fabricating crash bars for your 930 isn't a bad idea either, IMO.