I was non-weight bearing for 2 months and off the bike for 5 months last winter. I didn't do much different to stop myself going bonkers. I read, worked, blogged, thought. It worked.
With some motivation I think you'll be able to get fit enough for an SR Series and LEL next year, depends on how fit you are now and how much weight you put on while you are immobile. Don't take any risks though, one can do a SR Series anytime and LEL will come round again.