Already was, I mentioned that in my first post.
This may be out of your price range, but this looks (on paper) to be an extremely flexible and capable system, with plenty of room for expansion:
Strand Outlook and Vision Net.
Slider stations/touchscreens can be wall or console mounted.
Strand Architectural
(.PDF warning)
http://www.seleconlight.com/images/stories/Strand/Control/VisionNet/visionnetpremiere-data.pdf
This is probably a very expensive system, though it can be integrated one piece at a time. If I were designing a theatre and money was no object, I'd give this system a close look.
Way out of the scope of this project. Install alone on a system like that can be 10-20k. In my building triple that because its one giant single pour concrete egg.
I'm not quite parsing the description of where your existing controls are, but you might want to take a look at Doug Fleenor's line. They do have small architectural style controls that will hold a few scenes, and that interact nicely with controlling house lights from a console.
( Going from memory here ). One that I liked was a small box with a few buttons for presets. (I think it is the preset 10). Your DMX from the board goes through the device. If you are getting DMX signal from the board, it is passed through to the dimmers. If there is no DMX signal, then the preset 10 sends it's signals to the dimmers.
So when you fire up your board, the preset 10 stops telling the house lights what to do. When you turn it off, it starts controlling output. This is not completely clear from the manual on line, but it is how Doug explained it to me.
Also, mentioned that in the first post. The downfall of that system is it only works when you lose DMX, not something I want with this system.
So, I ended up finding a used Reflection unit from a production house in Montreal. Bought it for 345 shipped on Ebay. So, I ask again, why is no one making this thing anymore? It is exactly what a backup console should be.