It seems the broader issue is with gas piping generally, as it may have higher than expected impedance. I note that threaded connections, even with black pipe, are typically treated with (non conductive) sealants.

I've seen at least one gas fire result from a confluence of an ungrounded appliance with a ground fault to black pipe gas connection (IR heating likely damaging thread sealers); another in which fittings merely glowed red from a poor service ground and lost service neutral that resulted in excessive current through gas piping despite bonding.

Both events occurred in aged electrical systems installed under older NEC rules and which, due to ravages of time and poor maintenance, were not as robust as a new installation might be. I imagine that appropriately safe installation of any new product needs to be predicated on the way it might behave in an environment with such older installations, and appreciate the input from a electrical engineering perspective.

My plumber is planning to install a short section of CSST as the particular installation would be difficult otherwise. Since it is in my own home, my plan is to bond the appliance, gas fittings and my copper water line with #6 Cu, all liberally coated with an appropriate antioxidant compound.