Nice idea, but with the backlighting for the screen, I doubt you could get the Intuous close enough to work well. OLED screens don't need backlight, but nobody's making them yet.
I have an Intuous, just played with PhotoShop and got about a half-inch off the tablet, using a CD case and a couple of CD's and still had reasonable control. hmmm maybe.
Another issue would be drawing over/through those "swirlies" you see when trying to massage a dead pixel.
Z