I don't see why not. A lot will depend on how busy he is when you run into him. He does sign a lot of stuff, though, and bringing the backplate will be a lot easier than bringing the whole guitar! A couple of years ago I went to Sweetwater Music's Gearfest and got Paul and Brent Mason to sign the backplate from my PRS Brent Mason guitar, but that's a different sort of event--it's open to the general public, and NAMM isn't.