Sorry to hear of your injuries.

Have you ever tried one-legged drills on the turbo trainer? If so, you probably have an idea of what you'd be letting yourself in for, but if not, I'll tell you right now, it's a very different beast to two-legged cycling. Getting your dodgy leg out of the way is the least of your problems; on most turbo trainers you can just move it back and rest it up on the top of the frame of the trainer, but the actual process of pedaling with just one leg and muscling your way through the deadspots that make up ~60% of the pedal revolution is very difficult and tiring.

Sure, it's great for para-athletes who have to make do with one leg (and some doing so exceptionally well), but I would think the fitness benefits would be minimal and possibly even counterproductive (e.g. introducing massive L-R imbalances) for someone who will be returning to bi-lateral cycling.

If you can do anything else, e.g. swimming, reading, knitting, learning a new language/skill/hobby, I'd fill my time with that instead!

Just my two cents.