Yes, there are electric recumbent trikes out there, such as the Tadpole. A friend of mine got one after he recovered from a stroke and could no longer balance on a conventional bike. He rode it to work. It got him outdoors, with "anything is better than nothing" level of exercise.

That's it!

Sorry I lacked the proper name, but yes they are about. And definitely look like they could help people certain health issues. Although getting down into it would be something to consider for older peeps.