All the discussion of the difficulties of trikes on commutes is fair but it does occur to me that Clarion's original injury (being thrown off due to tramlining on a drain) would not happen on a recumbent trike. I have not fallen off. Ever. Not in 31,000 miles in four years.
Indeed, barakta - whose hands are her primary communication method and are considerably more fragile than most people's - doesn't bother wearing mitts on hers (other than for warmth): She's found that a wet hand isn't a problem with the grip shifter, and decided that the probability of injury is remote enough not to bother.
She's clipped kerbs/bollards a few times, but that's never resulted in anything more serious than need for some mirror/mudguard adjustment.
Realistically, to come off you'd need to overcook a corner at speeds in excess of R17, be hit by another vehicle, or indeed ride into a ditch. Even endoing it (which I've done a couple of times while balancing the brakes) is reasonably safe.
If nothing else, a trike might be a good option while recovering from your injuries...