I don't know as though a grill burner would give the heat needed here but you could actually make a burner similar to them but much more high performance, you could make it the appropriate length for you "oven" and have it put out a lot more heat, larger holes more gas and more air.
You could definitely get a more even heat with that style burner, as far as them being cheaper.....that I guess depends on where you shop and how much you can scavenge up, I've build somwhere around 8-10 propane burners and have yet to spend a dime....not trying to brag or rub it in anyone's face. just making the point that if you srounge around enough you can do almost anything with very little or no $.
welder19
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