The factory logo will come off with mineral spirits or lacquer thinner and a little rubbing. And just think, by permanently modding your collectible 20th, you'll make everyone else's worth that much more in 10 years.
EDIT:
Crap - now that I say that, I don't remember if the RG20th logo is silk-screened on the surface of the headstock or applied and then cleared over. I'd dig mine out, but I'm too lazy. If it's silk-screened, it comes off easy. If it's cleared over, you'll probably have to paint over it and apply a new logo. Or you could just sand it all the way off like the guy who butchered (he called it 'relic-ed') the RFR 20th on the Bay a couple of weeks ago.