As another thought:
What if the passage plug itself was drilled out using a
bit which then has a hose barb brazed to it?
The fuel hose could then directly connect to a barbed in line fuel shutoff on way the water separator.
the Carb passage would remain standard NPTF.
The separator would connect normally with a hose barb, no rethreading.
The hose would push out of the way without damage or kinking when working on the engine in tight spots.
Regards
Art
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