I'm neutral to this.
It is a cool idea, however it is the impact to the server that would be a trade off.
Due to how much Gang Chat actually gets used there are a few issues that could occur.
1. to many messages at 1 given time, flooding gang chat(Caused by people from all 3 servers using gang chat at 1 given time)
2. Server lagg, due to having to send/update so many chat messages between all 3 servers.
They are the only 2 things i can think of that could be an issue.
I will happily change to a Plus SP if i see a working version of this, tested in sim conditions to what they would be in on the ssrp servers, and then if it functions correctly with no impact to the performance primarily, then i would support this.