> A cup sized ultra reliable stove with a decent burn time would be nice.

You can get close to that with a Trangia stove in a steel mug. For example, this stove and this mug. You can make a stand from a wire coat-hanger, and a curved windshield from a tin can, and put it all in the mug with plenty of room over. I've not found a commercial lid to fit, but you can make that too.

It does seem like it would be a perfect product for someone, though, to manufacture the bits and put it together so we don't have to do it ourselves. I'd like it to have a shaped insert as well, with compartments for sugar, coffee, milk powder and OXO-cubes. And a small spoon.