Vargo makes a large (750 ml) Sierra Cup with lid that comes close. It is fiendishly expensive ($40).

I have been fiddling around with a standard size Sierra cup. A plastic "I Can't Believe It is Not Butter" tub can be fitted to the cup, tacking it in place with Gorilla tape. Unfortunately the plastic lid can't stay on when boiling water. I am fiddling with a lid made from aluminum flashing, but it is defintely a work in progress.

I agree that the cup over canteen (I like a Gatorade bottle rather than a Nalgene) to be the best combo available right now.
Geezer in Chief