Sorry but you will only make it worse (you could even end up in a wheelchair) if you either train now or rush the healing process & yes surgery may not totally solve the problem - you may still have "weak" knees & be unable to continue as an athlete.

You have to decide whether to do what you are told & pray that it all works out or do what you wnat to do & possibly end up unable to walk. I had both patella removed 30 years ago after 2 prior surgeries on both knees & am fine but there was never & still aren't any guarantees.

I would suggest that you use this "down time" to builkd up your strength in other areas of your body & look at your life, your goals & reconsider them & make some plans as to what you would do if you can no longer compete, then if the worst comes at least you're prepared & should be able to handle it that bit better.