Anyone remember the popular Jawbone Bluetooth earpiece from about 10 years ago? That thing was pretty insane, I was mowing the lawn on a call and nobody could hear the mower, just my clear voice. Super weird. Wouldn't help you on the listen side, however, Maybe you could get some IEM like the Shure with the yellow foam that would cut 30-33db on the listening side and find a Jawbone type microphone. That would be the closest you could get.