sorry, i just packed mine up to ship to a buyer so I don't have it in hand. But Im not sure if its possible to strip the heat exchanger off of it. Either way, the aluminum they use is over kill, and it is indeed a heavy pot. If you want a cheap, aluminum pot, that is highly useable, and very affordable, there is no better pot that the IMUSA, in terms of value
Its just not worth the money to buy a jetboil companion cup, only to strip it of all its features. But if you're dead set on buying a pot thats affiliated with a outdoor company of some sort, check out gear swap. There is a GSI double boiler for sale there. Similar profile to the Jetboil cup, and better suited for what I think your plans are
Hope this helps!