Has anybody ever backlit a keyboard for the purpose of displaying two different keysets? I switch to Colemak every once in a while with an AHK script that runs off of Scroll Lock, and I figured it would be a cool idea to switch to a different layout on the keys themselves via backlighting (e.g. one printed on the key, one somehow activated when backlit). I dislike the look double-printed keys as well as those goofy stickers.
I have to figure that somebody more technical and more imaginative than me could find a way to get something like this to work. Mostly just spit-balling here.