I had an Olicamp Space Saver Cup ( https://olicamp.com/space-saver-cup.html ), famous for nesting conveniently with a 1 qt. Nalgene bottle, and I wondered if there was a stove to go along with it in order to make a complete kit similar to the military canteen-cup kits.

Well, there is:
G.A.K New Stainless Steel Bottle Backpacking Stove
https://www.amazon.com/Stainless-Steel-Bottle-Backpacking-Stove/dp/B077JMH8BD

The stove nests over the Olicamp cup, to make a nice, compact kit. Because it's all stainless steel, it's probably heavier than a backpacker would want, but it sure is sturdy! (For those willing to make the ruggedness / weight / cost tradeoff, there are also aluminum and titanium versions of the space saver cup.)

As suggested by one of the Amazon reviewers, I made a slight modification to the stove to improve use with a Trangia burner (creating a gap between the top of the stove and the pot). Outside, with a slight breeze, I got 16 oz. of boiling water in about 9 minutes.

I put up pictures and more details here: https://7402.org/blog/2021/olicamp-cup-with-stove.html

I'm interested in seeing if it would work at all with a Sterno can. The internet consensus seems to be that Sterno is a pretty miserable fuel for this kind of use, but the appeal is for long-term storage, especially in the trunk of a car. Maybe it would take twice as long to get boiling water, but it would more convenient and/or safer for storage.