I don't understand why you don't want pedal assist, because it's easier. Plus you can still have a throttle. And you can set up your pedal assist to varying strengths. Mine has 5 speeds, so pedal assist goes from weak to powerful at the touch of a thumb button. The pedals only need to turn, which is second nature.

For tarmac riding you only need a 250w front hub, pedal assist. If you're intent on using throttle only without pedalling, you'll need more power for that, and more battery, as it's doing all the work.