Mate I fractured my Ulnar (nightstick fracture) about 2 years ago. I didn’t bother getting it cast and continued working with it. The work i do has some manual components, I tried to mostly use my other arm but still had to use it occasionally. The result I have a huge bony callous on my forearm that’s about three times as thick as the ulnar should be and still have a few niggles in my elbow and my grip strength is probably reduced.
So my advise would be to rest the upper body in the short term and use the next 8 weeks to proceed with the most intense leg programme you have ever witnessed. You know that leg programme you’ve always planned to do but couldn’t fit it in between your chest and abs workouts.
Take your frustration out on your legs. Sweat and piss blood, burst the capillaries on that pretty dial of yours and get them developed because if your legs are like 95% of the gym population, you could probably use it.
Seriously look on this with a positive frame of mind, work your legs hard and don’t think to much about your upper body as it will only slow you down.