Reminds me of Sterno which is roughly 30% water and 70% ethanol.
Sterno's flame is not very hot but who knows, if you use it within a very effieicent system like caldera or Ledmark, maybe we have the most feasible combo.

The ledMark design gives me an idea. Maybe all I have to do is use a can instead of the cone . I can visit a store and choose a can of something ( Nido powdered milk for example) and a pot that can go inside ( held in place by the lip of the rim). Remove the bottom of the can. Drill holes near the bottom for air inlet, and holes near the top for emmission exit. Volia, A "caldera cylinder" LOL.

To operate, ignite a Sterno can , put the "Caldera cylinder" around it , and insert the pot inside top of the can.

It will all depend on finding the right fitting pot and can. And the can should not be too tall. Maybe the medium sized Nido can will do, but have to find a fitting pot.

What do you think ??
Sounds simple and doable, unless I am missing something.