Are you sure that the bumper must come off? Can't you even get to the bulbs by taking off the wheel well liner. Seems to be much easier than the bumper.
My god, I can't imagine anyone having to take the bumper off just to change a bulb. You know that if that's the case, you can be sure that THE ILLUSTRIOUS DEALERS will definately scratch the hell out of the bumper.
I know that the dealer isn't going to scratch it on purpose, but they can't even get in/out of the car without getting their greasy mitts and shoes all over the interior. Do you thimk they really care about whether they scratch it or or not? There's a difference between an accident and just not giving a damn.