I'm not exactly an expert on the subject of the Fan-canon(Or Fanon if you like) of JJ2, and I'm not an expert on Fan Fiction either, but if you want it, my advice is to do whatever you want to do with your story. Just follow the Rules and Guidelines, write what feels right, and enjoy.
Anyway, I have a feeling that it would be best to continue this conversation via PMs if you wish to continue it further.