There's two distinct styles of ebikes. Pedal first ebikes, which are design to look and ride like a normal bike. And throttle ebikes, where the pedals are largely vestigial and included for regulatory compliance or emergency use. A throttle ebike will have a very limited size range, and a fixed height seat. Since you can't adjust the seat height, you won't be able to pedal properly, hence the throttle usage.
Either type of bike will work for your situation, simply use a higher assist level in the morning.