Indeed we are. Some aircraft have an AUX input built in, others don't. The ones that do, cut the music out when anything comes over the radio or when people talk to each other via the intercom. Sounds like that switch is exactly what the OEMs are using to make that happen.
That switch is exactly what I'm looking for, but the application is wrong. That would be something that I mounted into an aircraft permanently. I'm looking to modify the headset only. No modifications can be done to the aircraft, which also means I couldn't just carry that around and hook it up to the battery, and not all aircraft have power sources readily available to the pilot so an independent power source would be required.
You're right about me not being an electronics guru. I'm pretty handy with a soldering iron, but that hardly makes me an expert. Given the pieces to the puzzle I could probably put it together, but I'm definitely not about to wing it.
Now that I know something exists that does this (and what it's called), I'm looking around for something that will work for me but I'm not coming up with much.