I bought a cheapish ASL Intercom HS1/D a few years ago for €70, it has worked with all wired systems I've tried it with. I forget it at home more often than not, but not anymore! It could be a good investment for designers and technicians who are on headsets frequently. I agree with Chris that each comm set should be assigned to one person for the duration and that person in charge of cleaning.
The programmer should be the only one to touch the desk. Silver lining in all this, might train some sneaky designers to keep their hands to themselves (me). But still being able to see whats going on on the desk would be a must for me so I would still use Nomad as a client.
Having a separate ring for LX to communicate on would be ideal, but not possible in all houses at the moment. A dedicated plotting session would facilitate less talking over comms for LX. I remember an app stage managers were talking about a few years ago for houses that didn't have a comms system. Like the walkie talkie app for iPhone. Would a supplementary system like this work for LX temporarily?
Production tables. Should we now provision for production stations for all persons in the room? Traditionally Directors and Set and Costume designers did not have a table and were free to roam. Perhaps setting them up in a dedicated location in line of sight of all the creative team and on comms would reduce the risk of people moving around to communicate in the dark.