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@Dammit
Would it not be easier to leave the flask stock and make something akin to an immersion heater element that depends from the cap?
i.e. something that would hold your heating gel that goes into a tube that is then held in the centre of the liquid due to being a part of/attached to the cap.
In fact thinking about it you could just make a water/gel proof container and drop it into any old thermos?
That way you re-use any thermos but can guarantee piping hot soup/tea/whatever with the simple addition of your fiddled with hand warmer gel product.