I have a similar (working) situation being 2 consoles playing the same Hauptwerk computer. But these consoles are 150 ft apart. I mentioned "working" as in almost 2 months. You may not want to go to this extreme because it is fairly involved and not cheap. Quite a bit of hardware with the costs getting pretty near installing 2 separate computers. The "saving grace" is that these 2 consoles (in the same auditorium) use only one computer, 1 sample set, and 1 - Hauptwerk license. I don't usually like to put all the "eggs" in one basket, but - - - So those considerations led to this: Two consoles each with their own computer, H/W setup and sample set playing the same audio system would be simpler way to go by far.
We are using 2 - Gefen USB20RU10 (480 Mbps) USB 2.0 LR Extender systems. Each extender system can extend USB 2.0 up to 300 ft.over a CAT 6 cable. Each extender system consists of 1 - Sender and 1 - Receiver module.
One extender system extends MIDI via USB 2 from the secondary console to the computer with negligible latency, (no more than with real ;pipes). W\e did use shielded (solid conductor) CAT 6 cable.
And the second extender system extends the display (visual monitor) from the computer to the display monitor on the secondary console. You need various converters for the MIDI and also for the display monitor at the secondary console which has touch screen capabilities.
The object was not to play both consoles together, altho this could be done, but rather to play the balcony for use with a choir, and the main floor console for such as concerts. This system is in place but not being used presently yet as there are other considerations (not directly concerning this setup) being ironed out. For one thing, we are waiting for the main organist to recover from recent surgery to give both consoles a real work out. In that regard, I'm looking into a way to measure max MIDI output from either console. Any ideas about how to do this?
BTW, there are other USB (extender) systems which support USB 3.0 throughputs of up to 5 Gbps at double the cost. And greater (extension) distances are available using fiber. But who wants to play an organ over a mile away?
But it does work - so far.
Rgds,
Ed