Never seen a bra....on a vehicle....that didn't do more damage than good.
Stickers going bad? Just get rid of them. If you don't like the plain white or ghosting from uv fading, a vinyl wrap would do the trick.
Carbon fiber look wrap would be cool.
Another option I've considered is you can get very thin diamond plate aluminum sheeting. Looked into it for the TC. Would have added only about 50lbs to the front cap iirc and was not terribly expensive.
Clear bra is not the solution, even if in new condition as it's designed to go over smooth surfaces. The raised surface of the stickers would make the application or final appearance less than ideal.