A thought occurred to me last night: why do you need to bother with lugging a huge battery onboard when you could just flush the battery and the motor(s) into the floor of a purpose built trailers.
This solves the the hard winter starts problem and awd (lack of it) problem for BRZ in winter by providing 4x6 layout and allows for a 6x6 setup for the rest of the subaru lineup. Just hitch up the trailer, plug the trailer cable and (hopefully) go. But then, there is an issue of folks insisting on running all season tires on the trailer year round.
With a two wheel trailer you could have a 6x8 and 8x8 setups: the heft of the battery should reliably anchor the trailer to the ground allowing for a perfect 50:50 weight spit between the wheels.
Me thinks having a horse trailer would work even better since there is
600 kilo worth of meat helping the wheels to cut through the snow (multiple that by 2 for a double, but then there is an issue of a unperfect weight distribution side to side)