I meant just register it in one of the slightly less than half of states that let you do that.

Even if some Karen narcs on you to the tax man unless it's an especially slow day the tax man will say something along the lines of "It's a what? We don't register those"

The registration/tax people aren't in the business of giving a shit about the nuances of the vehicle code. They're in the business of collecting money. It's not like you're dodging meaningful fees on an entire truck fleet. You're dodging what would be a zero to them since they'd never let you register it. What are they gonna do send you one of those "we believe you owe us X, pay up or we'll use the full force of the state to fucking stomp you and ruin your life" letters with X= $0. I'm sure they'll get right on that.