Plus the little door and the flip-up protective cap are a pain.
So,
I went out looking for a better solution. External 'male' 120V plugs are fairly rare but they are used on some RV's and I finally found one. I think this will work though mounting it may be a challenge. The interior wiring needs to be changed out to support my Watt-Hour meter and the plugs for the battery warmers (that are on order). I think this could work.
The section of the car that the new socket needs to go on is not flat. I drilled the necessary holes and test-fitted it. Then covered that section of the body with plastic wrap and coated the back of the socket plate with black RTV silicone sealer and then screwed it in place. The sealer cures to match the shape of the surface it's on and presto, you have a matching gasket. Updates later.