Bite the bullet and get it fixed. There will be another season after this coming one, and one after that and so on. If it really eats at you, there is always South America.
Riding on a jacked knee is only going to be half assed at best and at worst you could complete the tear and do even more damage. Also, it sounds like you'll still get to go out late season anyway.
It sucks, but injuries suck. Just take care of it and be ready for late season. That's generally when the best riding is anyway.