I'm not familiar with the JetBoil kit. I'd only be concerned if the cooling rack might scratch the non-stick coating. Looking at their site I would think their kit should be able to do this; The best might be the 5L Cook Pot set ESP. if the lid vents can be closed to keep the heat in.
I've done it in my old aluminum BSA mess kit pan and in my new Stanley kit. Works better in the Stanley than the old BSA kit but my Lodge Cast Iron is the best. The Cast iron takes a very long time to reach temp but once it does it stays nice and even. The Stainless Steel Stanley gets up to temp faster but also lacks the Mass to keep the temp so needs to be minded more. The Aluminum kit heats and cools really quick and is a much smaller space so can be hard to keep the top hot as the aluminum pan on top acts like a heatsink. If cooking over a camp fire you can put some coals on top to fix this but on a burner it's kinda difficult.
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RonaldHoward1313 's idea of using a heavy metal trivet would help solve the Mass issue and make the steel or Aluminum setups more like the cast iron
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Another way which may or may not work depending on the food being heated would be to put water in the bottom of the pan under the rack. this would keep the temp to just above the boiling point at your altitude. (You lose about 10*F per mile of elevation. So 212*F at sealevel, ~202*F at 5280 feet, Denver Co, and ~192*F at 10560 feet in Leadville Co.) Until the water boiled off at which point you would be steaming the food and the temps would start to rise again. This works for starchy veggies and items in
*Boilable* Seal-a-meal vaccum bags. Careful taking the lid off you don't want a scald in the back country.
Putting the setup into a Weber propane BBQ using the bbq on low - medium heat and trapping the heat with the BBQ lid works wonders too.
Boort