Yeah, the variable for every page is exactly the cumbersome trick I was thinking of. Your idea of nesting the variables into device-then-page would probably be more efficient, so if there's no other way, I may do that. Of course, the other option is to just forget specific pages and jump back to the device's first page. It wouldn't be quite as elegant, but it'd probably be good enough. Still, the exact-page method would be preferable.

Anyone else have ideas?