I've also considered a Colgan bra for the front that I could use during my weekly commute and then take it off for the weekend car shows. That would certainly do the trick, it would just be a pain to take the bra off and put it on again all the time.
Sigh..
I noticed that 3M had a clear spray film called "Paint Defender" that did exactly what I want, but it appears that they took it off the market a couple of years ago. I wonder why they pulled it?