Would this Alfen wallbox expect by any change expect a MID power meter?
It just happens I created exactly that for my own system, a freely modifyable MID faker (esp32 with modbus) 
It allowed me to control the EV, by faking the power usage at my place.
So now I only charge when I have a surplus solar, or when the energy price is low (LOL, last week the prices where negative, si i actually got paid to charge my car 
)