Ok, finally had a chance to look at it. Looks promising.
First off, the latch is nothing more than a spring-loaded pin that gets pulled back. nothing you can do with the port lid closed. Need to tackle it from the inside of the car.
As Don mentioned, when you remove the small plastic cover, that gives you access to the backside of the charging port. What you will see is a contoured plate that is held on with a number of bolts (four that I could see). I *think* if you remove those bolts that will allow you to remove that plate and hopefully provide access to the back of charging port area from the inside of the car. Perhaps first remove the whole plastic cover over that right rear, as that will give you easy access to those bolts and plate; however, even without removing that large cover, it looks as though those four bolts should be reachable (just don't drop one).
Do let us know how it goes.
EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV