The company that runs a scooter sharing/rental service in my city uses a "Torrot Muvi", with a 3 kW motor it can keep up with normal city traffic even with two people. Speed is limited to 65 km/h. Looks kinda nice too.

https://torrot.com/en/motorbikes/5/133/muvi

But that would probably be one of the "underpowered" models for you :)