You can get 3/8" by 1/2" bushing, which interior and exterior threads going in the same direction, so going opposite, like you say it would be tight.
I do have a fitting that came with a flex gas line that has the threads I need, but it is steel and it has a flare fitting on the end that i need a male pipe thread.
I did a fitting in McMaster - Carr (Item no. 5485K33) in brass that looks like it has threads on the inside, but can't tell which direction.
I really wanted something in stainless and that's why I thought of you.
Bill
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