Brilliant mate, absolutely brilliant!!
I’ve only had a small wrist injury but my advice is make sure you do as much “rehab” as possible on both hands. I lost a bit of dexterity and now the injured wrist goes numb really easily on long rides (normally only road riding though). It also gets cold easily.
I’m not sure on what exercises but anything which helps dexterity and strength. I have a powerball thingy which is quite good but I didn’t really do anything to recuperate until years after the incident.
Good on ya! Keep shredding!!!