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We have actually tried this, but with one-way communication only. We used a small PRM walkie talkie (no permits required to use them, as long as they are within the assigned frequency band).
The official had an ear piece, and the radio on a pouch on his belt. The radios are quite small and light, so it will not be in the way. These PRM radios have many different channels, so you could have a different channel for each position, if you want. We had just one official wearing the equipment.
The trick is of course to know when to talk, to make sure you don't disturb the official. We would give short reminders after the play was completely over, such as "Don't forget to kill the clock", "Remember to square off", "Try to pinch in further", and so on. We found this to be a very useful tool, but we pretty much used it for mechanics only.
I suggest you give it a try. It might not work with every official, but most of the guys we tried it on liked it. You could see their mechanics improve from drive to drive. Giving almost instant feedback while they are actually doing it, and not watching tape, is a great teaching tool.
Good luck!
Now I'm gonna watch a NFL Europe game!
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