Hi, I can code this for you, I have +5 years experience modding many open source and paid forums, including vBulletin, SMF, phpBB, Xenforo etc.
If you want the mod to work in real-time your server must have NodeJS installed, I'll code a Javascript module in the vB mod to perform the chat functions with the server.
I understand the project in full and I'm confident I can develop it.
If you have any question just let me know.
Greetings!