I just googled 'sleek looking ebike' and found out about the brand 'Ampler' which could fit your design wishes. Since your second picture is a Vanmoof bike you are probably aware about that brand.
Pic 1 is the Axel. Pic 2 the Curt.
What do you say?
In the end it is a bike. If you can ride it nicely what else matters? People will stil identify it as an ebike most likely and person like pic 3 related will still laugh about you. Why care? You won't win any coolness competition anyways.