I run a radio sattion and hit this very problem for out bots.
In the end I customsied the domson Shoutcast tcl and just had it read from a second relay JUST the listeners info and increment the listener count used by the new relay's data.
I am planning on writing a total rewrite based on domson's excellent (but sadly unsupporterd) shoutcast tcl in the near future. This rewrite will remove many of the limitations of the domson script, and support a potentially unlimited number of relays.
If I see this thread still active when it's completed I will happily forward a copy of the finished and tested article to you.