This 10 KW, lower cost, wall charger is designed for vehicles with a single charger. The cable would be thinner, lighter, and cheaper to produce, and perhaps this model would have a shorter cable (10ft) to further reduce costs.
While the existing 20 KW High-Power Wall Charger works for all cars, it is quite pricy and has double the needed capacity for vehicles that can’t use more than 10 KW. The High Power Wall Charger retails for $1200, so perhaps the lower power model would be close to half the cost – perhaps $700.
We are going to consider this implemented. The Gen3 wall charger is limited to 11.5 kW, and uses a thinner more flexible cable, and only costs $500.
My NEMA 14-50 cost me $400 installed in my garage. I think the installation costs would be similar for either the HPWC currently available or a new one for single charger vehicles. If I purchase another mobile connector from Tesla for $500, that would basically serve as my permanent home charging unit. Since I rarely charge outside my home, I haven't yet felt a need for another mobile connector cord. I have it coiled up on the wall with cheap J hook from Amazon.
Having built a number of custom EVSE for Teslas including my own, you would only save about $100 or so. The cable and contactor are the only two things that would be cheaper, and they wouldn't save you much.