> For me the bigger problem is that it's classified as a motorcycle, which may mean wearing a helmet, and needing to have a class M license.

The only state that requires a motorcycle endorsement for the Polaris Slingshot (an "autocycle" style trike) is Massachusetts, but that state's motorcycle definition exempts fully enclosed vehicles so it shouldn't apply to the Aptera. It's trickier to find a quick summary for helmet laws though. At least some states have exemptions for fully enclosed vehicles and some exempt all autocycles even if they're not fully enclosed. California has an exemption for enclosed trikes that meet certain minimum size and weight requirements which I expect the Aptera to meet.