Interesting explanation, didn't realize about the need for isolating the home from the grid during power outage.
But if power outage is irrelevant (because it never happens), and main goal is to use the energy from Lucids battery to power 'something' in the house, what would be the minimum needed equipment (cabling, chargers, converters, powerwalls etc.) to be able to establish that? Even a one 230V/16Amp socket directly connected to the car, to power a 2500Watt heater in wintertime and an airconditioning in summer time would be enough in this stage.