My wife has an arthritic knee and we bought a e-bike with a throttle. So she can go for a ride with me and then when her knee starts twingeing she can just stop

My wife has an arthritic knee and we bought a e-bike with a throttle. So she can go for a ride with me and then when her knee starts twingeing she can just stop peddling and carry on. We did consider a mobility scooter, but that in no way looks cool in anyway possible.