Two alternative routes...
See what the folks say at the welding supply shops. In some cases welding torches are run off of natural gas. And some jewelry repair firms use a natural gas compressor as part of their torch setup. Can not imagine that a hand held torch would have to be connected to rigid copper tube!! One would think that there is a solution. Just that the plumbers have no experience in your needed area.
If all this fails then it would be time to contact your local assembly men. Or your local city counsel representative as a suggestion. If that fails then a MP or their staff if they are willing to assist.
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