V2H Integration with PW3 and Future-Proofing

Considering installing solar with a Powerwall3 using the built-in inverter but wondering what compatibility, if any, there will be between non-Tesla vehicles and non-Tesla V2H hardware and the PW3. It doesn’t appear that GMs V2H hardware is compatible with the PW3 so that would probably be a somewhat redundant and kludged solution. Any thoughts on what future interoperability will be?

Trying to decide if I go ahead now to get the 30% tax credit or wait a year or two for a more elegant solution.