I've seen three of these attempts to make chatrooms off a bulletin board forum, and every time the chatrooms changed into something quite different with a distinct culture of their own, as certain interests or opinions develop among the chatroom regulars. Then some users who are regulars on the chatroom abandon the forum for the chatroom culture... which I'm not saying is necessarily a detriment for the forum, since the cultures are rather incompatible by that point. And I don't see how it could be any other way, since the forum doesn't get to see the conversations in the chatroom, and even the moderation might be different.
This is a bit of an extreme example perhaps, but consider my shock when another language learning forum once had a Skype chatroom splinter off, and I was told by the chatroom regulars, years later when I discovered it, that yes the Skype group had the name of the forum but now it was mostly a drugs and esotericism chatroom. My brother once joined the chatroom of a forum about a certain videogame, and as the years passed, the number of chatroom regulars dwindled until there were only about six friends left, and nobody even plays the videogame anymore.
I did abandon a forum once for a splinter chatroom where I'm still a regular (not the drugs chatroom!), by the way.
I'm not saying it'd be a bad idea to create a parallel LLorg chatroom, but it should be born in mind that at least some cultural differences are likely to occur...
ἐν ὀλιγίστοις κεῖται τὸ εὐδαιμόνως βιῶσαι
'To need little is to live blissfully.' (Marcus Aurelius)