I'm guessing you really won't know for sure until about March, that's 4 months from now. And yes, so much will depend on the severity of the break and the speed of recovery and PT. I had some tendon-related knee issues, and recovery involved a lot of rest, then slowly returning to walking, but I was advised to start with walking every other day for shorter distances (no more than 4 miles), then to two back-to-back walks with one rest day (still at 4 miles), before increasing my distance - it took me about 6 months to get where I wanted to be before leaving for my Camino. But I'm not a doctor and don't know if bones heal faster than tendons, but 4 months does not sound like a lot of time, but might be more than adequate in your case.
I guess if it were me, I would be looking at whether I could reschedule the flight and the deadlines involved with that, (I'm guessing that with the accommodations, there's more flex on the deadlines) then making my decisions as those deadlines approached - hoping to start as originally planned, but being prepared to postpone if the recovery doesn't feel like it's ready in time. Bummer, but worse would be having to abandon due to an injury that didn't heal adquately.