Damn dude, that's the worst kind of fracture, you might actually be able to heal bone, just that the distance things need to grow & lack of ability to load means the healing will be ultra slow.
That distance is way too high. i would be concerned about it healing funny & deformed with no support.. bending other bones around it. Ideally, you don't want that happening but it's often what they let happen to patients instead of fixating this bone.
Complex, custom fixation is possible. If you end up healing funny then i would bring up the idea. otherwise your shoulder bones will not be aligned and then you will have issues with this shoulder in time.
Another problem is, things are so screwed up that you can't put small amounts of pressure/work on the bone to prod it to heal.
When i had my tibia fracture, i was an overachiever in physical therapy, i also took
this supplement religiously, plus collagen, to provide my body an extra amount of most raw materials it needed for repair. This full length bone fracture with 2mm of distance between still took 9 months to heal.
You can't do that so i think it's going to be a while.
You know, a recumbent or semi recumbent bike will take load off your shoulder versus an upright.. the only load on it will be a steering motion and it's weight resting on the seat back.. might be a good path for you once you're ready to saddle back up.