I broke my collarbone a few years ago, it was in 3 pieces so I did a good job of it. I got a plate put in and was back in action pretty quickly. I got back on the bike within a week (not sure the doctor approved) and back in the gym a couple of weeks later.
My collarbone gave me some pain at first, mostly when doing dips as it’s pretty highly loaded in that position. Front delt raises also hurt for some reason. I figured it was the plate and the bone flexing at different rates, causing the screws to pull in their holes. The pan subsided over time, and once there was pop which hurt. Now I think and plate has snapped in the middle where one of the bolt holes goes through. I can feel a ridge across the plate in one spot. I think the high loads flexed the plate back and forth until it fatigued and cracked. Now it doesn’t hurt so it’s a good result.
@FrankTuna do you have a plate on yours? Do you feel the pain in the bone or just general shoulder pain? Weight training will definitely stimulate the bone to adapt and increase it’s strength/density. If the issue is the bone itself then weight training would definitely be worth a try.