I see a company in Belgium is offering a kit to add wireless opening of the Tesla charge port, and through control signals to unlock the cable. I understand the charge port unlock needs a wireless signal added to the plug, but could the unlock cable signal be added as a charger firmware feature? (which seems to be a pilot type message). So you hit a button on the charger, and this tells the car (a Tesla) to unlock the plug at the car?
You could just buy this kit, they also sell a kit with a plug and button and a readymade cable with 2 plugs. Note this set up is generally for European Tesla drivers who do not have a Tesla branded home charger. European plugs are different to USA sold cars.
There is a video on this link: