That's a verrry intersting idea, using 1-ply instead of film--tell me more!!
I'm always looking for ways to cut steps out of my process to save time.
Doing double transfer is a pain, and a big time sink. Film is sometimes
disappointing, because if the image is photographed by the wrong person, a
grayed out background can result in the final product.
Of course, the erasability is an important factor--what if you, God forbid,
you should make a boo-boo?