Not sure the market will justify a right had drive Aptera for some time even in Europe where the majority of driving is on the right side of the road. Certainly none of the prototypes being advanced to production are right hand drive
If I remember correctly, the Australian market also requires the vehicle to be narrowed by 0.2M, just like the EU+UK market (EU market needs a footprint of 2Mx4M or less for 3 wheeled vehicles under the L5e-A regulations, IIRC Oz has the same 2M width restriction, but as far as I know doesn’t restrict the length). A year or two after production of the Launch Edition seems reasonable.
Changing the width/length and drive side while minimizing overall part changes will be significant reengineering. This is akin to the difference between the tesla model 3 and y. Seats, dash, batteries, powertrain, electronics, wheel pants, rear suspension and misc hardware could be potentially be shared but it is still a significantly different vehicle.
The parts I see as most likely requiring a change are the body, front suspension, dash, and centre console. I’m not sure about the rear suspension, maybe the hatch can be truncated without changing that?