In reply to Grusha: mt borther uses a disc (from a mountian bike with disc brakes) to hole his espresso pot on his gas cooker. Forget how big the trangia pans are but mybe something like this could work.
In reply to Grusha: I used to sit the burner on the ground and put the base of the trangia over the top, with the mocha sat on top of that - not very satisfactory, but it worked up until I bought a multifuel stove
Alternatively, a simple cylinder of 'hardware cloth' big enough to surround the burner, but small enough to support the espresso pot. Cut it so that it's the height of the top of the burner + 24mm.
Or a food can with both ends cut out, and V-slots cut around bottom and top, to allow air in and flame out.
Or a dedicated Caldera Clone for the espresso pot...
The Unterwegs thing looks nice (and almost exactly as per my quick scribbles), but I don't see why they didn't make it so that it engaged with, and locked in to the existing 3 Trangia pan supports. So it's unnecessarily heavy, as far as I can see. Ah, maybe the extra bits are to do just this in the larger Trangia 25.