Clipper Creek labels its EVSEs by the breaker needed. OP can buy the 50 Amp 14-50 plug model, pop in a 50 Amp breaker and be good to go with 40 Amps to the car. This presumes that the electrical panel load can take another 10 Amps
Another choice that works out the same way is to buy a Grizzl-E, or another EVSE vendor with the same setup.
Your other comment about not buying a J-1772 EVSE misses some of the trade-offs:
- You are not putting yourself into a Tesla only garden
- Visitors with non Tesla cars can charge
- It is easy to leave the J-1772 adapter attached day to day, and just install a Tesla holster
My take: if OP is keen to charge at 48 Amps then buy the Tesla hard-wired EVSE and expect to pay $$ for the installation unless it is DIY. If 40 or 32 Amps to the car is good enough then consider the trade-offs and use whatever makes you happy.