Eric, writing about this post on a novel Hungarian automobile intended to be driven by people in wheelchairs, sez,
40 years ago wheelchair users in Great Britain were driving around in something very similar – a single person vehicle with a 197 cc engine operated with a joystick.
The 3-wheelers had a flap-down seat extension that allowed you to transfer from a weelchair to the seat, and allowed a (folded) wheelchair to be stored alongside you. Of course, though strictly forbidden, the flap also served as a passenger seat!
(Thanks, Eric!)