Stephen, The point is the headsets. The kids, just don’t want to wear them. I would much rather that they do to protect their hearing and for internal communication. It seems to me that if they are on their own ‘channel’ listening to their own music, they should be happy, but what do I know - they are teens?
The problem is that usually, I have only one teen on board or if I have two, they want to listen to different music. If they are both onboard and they want to chat or listen to the same music or both, then headsets are OK, otherwise, “no thanks!” Well, maybe just, “No.”
I agree that cabin noise could be a problem, but when I saw the device, it was less than $75 I though it was a neat idea. Since it is an old style handset, it fits fairly snuggle to an ear. Noise would get in through the mike - no noise cancellation there - but I think it would be manageable.
I suppose the first problem would be to fine an old military style handset, the type with the push-to-talk button, then the second part would be to modify the wiring to airplane style. Last, and perhaps the most crucial would be to match the impedance. I don’t know where to find the first; I’m OK with the second; but the third is well above my level of incompetence.