This will sound insane, but when I broke my ankle / heel about seven years ago and had a boot on, the easiest car for me to get in / out of, and drive, from the below fleet, was the Solstice.
All the other cars required a knee bend and maneuvering the boot, and it was awkward. With the Sol, I just stuck my leg straight out toward the well, and followed it in to the car ... A knee injury / immobile knee might be different
It's really about the only time I've driven the car. I think it has pretty much sat in the garage ever since.