I think the simplest would be to install a NEMA 14-60 with a 60 amp
breaker, and swap in a NEMA 14-60 cord cap on the charger.
If you are over 50 amps, you are exempt from the NEC GFCI requirements,
even outdoors. A bit silly, but this is what the NEC rules say you can
do....
You could subsequently make a 14-60 to 14-50 adapter, but that would not
be legal....
Bill D.
PS
The trip limit of 5 mA on a North American GFCI is just plain silly. The
rest of the world sets the trip limit to 30 mA for GFCI (or "Residual
Current", as it is called elsewhere.) Hospitals, daycare centers, and
the like, have lower trip limits, which makes sense in those specific
locations.
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