Do self-balancing electric unicycles count? They are a lot like self-balancing electric scooters, but with one larger wheel between your legs. The big advantage of them is better transportability: when you fold the footrests, they are compact enough that you can treat them like a chunky hardshell briefcase.

Electric unicycles (EUC) are an entirely different beast far out of my wheelhouse. I've never ridden one and only once had a fleeting discussion with an EUC rider. I've not previously been asked about them and wouldn't have anything to say. They're pretty different in form factor.