Here's a fictitious story...
Post-surgery, they put my right leg knee down in to a splint for a week. Was in swell and pain and didn't feel like driving, just needed to recover, rest... A week after, another splint, downsizing a bit, further managing swell. Still some pain, plus splint seemed bulky, figured the foot won't go into pedal cluster. Two weeks after surgery, most swell, pain gone. A male animal healthy but with a bad leg. Not being able to move just kills you. Now they put me in this "cast." I didn't know until then but when you say "cast" today, it's not plaster. They have this fiber glass bandage you put around your leg, wet, and it reacts and hardens in 5 min and becomes a "cast." very compact, light weight, yet pretty solid...very impressed. I wouldn't mind giving a little scratch or two on my beater E30, so here I go test drive this five speeder. Easy. Can drive almost normal except not being able to do heal-toe and those fine control of gas and brake. No need of those for street driving. Getting comfortable with E30, then test on 84 carrera. Braking is a little different where it requires more force than E30 but in fact, easier than E30. It has more space around the gas pedal. Street driving very doable. In fact the roar of the 3.6 you hear from the rear through open sun roof and side windows, and the breeze that hits your face as you cruise, you think as if the injury heals as you drive.
Conclusion...being in the fiber glass cast, knee down all the way down to toes, it is doable.
After being in the cast for two weeks, they take this cast off my leg. Then my right leg goes into this plastic boot. It has a sole like a space suit, wider than that lean cast I had. Finding out that the boot is too big to slide into E30's gas pedal space. If I can somehow press the gas pedal, I can do brake with the boot and clutch as usual with left foot, so probably drivable. Carrera...pedal space is a little bigger but still tight. The boot will get in to the gas pedal space but if I had to brake quickly, I'd be in trouble.
What I would need probably is to put some spacer as thick as 2 inches so the gas pedal sticks out above brake pedal. Or, route throttle cable to shift lever and fab a throttle leaver ala lawn mower or snow mobile???