Consult a sports therapist for shoulder strengthening exercises. They'll tell you that a brace will weaken the shoulder. I don't recommend against it, however....
I have dislocated both shoulders, and broken both collarbones, one of which healed crooked. One of my shoulders rides about a half inch higher than the other when I stand straight. But I strengthened the rotator cuff area and shoulder press 225lbs, no problem.
Heal up 150%, before you dream of touching the bike, and strengthen that area. not only will you feel better physically, but you'll be more confident that it will stay in joint. When I first did mine, i would wake up in the middle of the night with my shoulder dislocated, just from rolling over in my sleep.
Sports therapist consultation is worth its weight.