To my knowledge there is no forum dedicated to Echo Bazaar and as such no RP sub-forum, which is a pity. But the game being the way it is, I doubt it will stay this way for long.
As for divorceing your account and linking it to another one? I don't know if that's a standard option but I imagine if you contact the managers of the game (via e-mail or even a call) and tell them you want to switch the twitter feed it's connected to, I'm sure there is a chance they would indulge you.
Off topic: if you're wondering why you're not getting many replies, it's because this sub-forum is mostly devoted to the playing of RP's and forum games, not so much the disccusion of them. It may be a good idea to ask this question in the Off-topic section, in order to get more replies.