Cant think of any in home consumer space, probably something like that may exist in pro sector.
A mini-PC like Acer Revo or Asock Ion 330 running XBMC could feed a VGA signal to your ZV Pro 250 and maybe that can stream the GUI to the other TV's.
For controlling it there are a variety of ways through I'm personally not familiar with them, XBMC does have a web server and there is a mod that allows you to control XBMC via an
Android Phone (
install instructions) or via the
iPhone.
They could basically act as the remote control to the PC running XBMC.
As for XBMC itself if using an Atom/Ion mini-PC there are a couple of things to be aware of with current official 9.04.1 release.
1) XBMC linux has GPU video decoding support but only for Nvidia GPU's and under linux. The Atom CPU is too weak to handle video so you need the GPU to do it.
2) You can install XBMC Live (standalone mini OS that boots straight into XBMC or
install linux OS like Ubuntu & then install XBMC as an app.
3) There are a variety of minor issues that need to be addressed if installing XBMC Live 9.04.1 on an Ion PC
this site shows them.
A new 9.11 alpha release is out but its still buggy and in no shape to be deployed in that environment but it does address all the issues in 3 so in a few months time I'd update it to that once the final version is out.