No opinion on the utility of fitting in your case, but I had 3-level cervical disease and got prosthetic discs above and below an ACDF at C5-6 instead of three fusions. I ride the same drop I rode when I raced and can trim the mainsail on my boat all day, but it took months of fairly serious rehab to get there. The focus was on strengthening the deep neck muscles with isometric exercises and maintaining a chin tuck when doing all the usual upper body weight-training stuff. When I was discharged from rehab someone at the (military) hospital put a note in my chart clearing me for unlimited activity, including a 100 lb ruck.
With three fusions you would have less mobility, but you could still work on the muscular endurance. If you’re not doing it already, you might ask your rehab team.