There's a way to do everything, you just have to come up with it!
My advice is get switchcraft at imentalism.com and once the billet has been written on and folded, just gesture as if they are supposed to give it to you, as soon as you do, pass it straight back to them and say "no, I don't want to touch it"
Of course, you've already switched and can now peek at your leisure.
Alternatively for REALLY hands off peekage, look at Labco's Mindbuster electronic impression board, it's quite pricey, but it's a wicked tool!!!
D.