Sorry to hear about your accident. It sounds like you were quite fit with a good base before the accident and surgery. It is way easier to regain some lost fitness that it was to develop that fitness in the first place. Logging as much vert as you can manage before your trip will be the key thing since the technical challenges of the route are not too daunting for you. Regaining single legged strength should factor strongly into your plan as you have no doubt been favoring the injured leg. This will have to be compatible with any PT program you are on and I caution you to not rush the heavy weights if you PT says you are not ready.
I suspect your base will come back if you are able to get in a bunch of time on your legs at low intensity in March and April. If your leg can handle it I high recommend a few weeks of weighted hill climbs on the steepest terrain you have access to.
It’s not ideal but I think with your background you still will have a good shot at pulling this off. Maybe not in the style or speed you are capable of with a solid winter of training but still satisfactorily.
Good luck and keep us posted.