How are European 2 prong plugs wired? Is it 2 hots or 1 hot and 1 neutral? Does the European electrical code call for bonding the ground and neutral somewhere in the building (if there even is a neutral)? Does any of this matter to a North American EVSE, or is that taken care of by the converter/adapter? I know my Level 2 EVSE needs two 120V hots and and a ground to get 240V to the car.
I will never be plugging a North American EVSE into a European outlet, so I don’t need answers to the above. I just wondered if there were more to the OP’s question than simply volts and Hz.