Forum rules, man.
Paragon, Aoyn, Valucre, Ayenee--all the like. They don't exist to Dystopia, and Dystopia doesn't exist to them. For all intents and purposes, Dystopia may as well be a series of novels read by characters on other RP forums. That's about the extent that Dystopia could exist to them (and vice versa).
We do have a board here where RP is not strictly alternate universe, though. If you'd still like to do the cross-forum plot, feel free to do it
[here]. Otherwise, you wouldn't necessarily be doing a cross-forum plot, but just an alternate universe version of what you've been doing elsewhere, y'dig?
Also, as hinted in the above post, transcending universal boundaries is illegal; cannot occur on this forum, no. We seriously don't have a lot of rules here. There's no point in trying to break what few rules we have.