How can I use a Bluetooth headset in an ATR 72 cockpit? Is there any device available to connect a pair of Bluetooth earphones to the audio system of an ATR 72 aircraft, to receive and transmit on the radio? 

The stock headsets are horrible. I own a David Clarke headset too but the cables are a little annoying. If there's a solution to use a Bluetooth headset with a mike to replace the headset in the aircraft it would be lovely.
Flying Magazine reviewed headsets for pilots back in 2013 and four years ago there were already bluetooth-capable headsets in the market from Bose, David Clark, Sennheiser and Lightspeed. You might want to start there...