Have you ever considered swallowing your pride and allowing your injuries to heal?
Funnily enough, my guard has never been better.
As I can't fight from the bottom of side control, I've really been limiting my practice to passing/sweeping drills, from both the top and bottom of guard, with anybody willing to train, and quite frequently, with my instructor, and I've improved my half and full-guard games by a huge margin. Enough to give a few good purple belts and my instructor difficulty in passing. I'm having a ball.
Anyone with any similar stories/training advice for injuries?