OP here, with an update.
We tested our 50 amp outlet today with our modified Nissan EVSE and it ROCKS! We took a battery at 66% to 100% in under two hours and probably less (we were watching TV and being lazy as we just had our second Phizer shots yesterday and felt a little blah.)
As soon as we plugged it in, we heard two chimes instead of the usual one, and heard a soft clunk from under the hood that doesn’t happen when we use 120v “granny” mode. Level 2 engaged, captain!
$175 for the EVSE and a couple hundred for the 50 amp circuit installation by a licensed electrician. I call that a bargain.
I've been a puppet, a pauper, a pirate, a poet, a pawn and a king.