Another note, from someone who has suffered a wrist fracture and had to wear a cast on my dominant hand for months.

If your dominant hand is out of play for the next foreseeable future, now is a good time time to train your non-dominant hand and that may have the benefit of making you more ambidextrous for certain tasks in the future when your dominant hand recovers. If the injury is in your non-dominant hand, then likewise, your dominant hand will get stronger. And maybe you can even do things you needed to do two-handed, one-handed.

Best wishes