The GoPro records a stereo audio signal. The Bluetooth Pack has two sources of audio, the built in mic and the intercom connected to it. Why not record those signals to a separated left and right channel.
At the moment, whenever you switch on the mic, any ambient sound drowns out your voice. But when you switch it off, the noise cancelling properties of the intercom while good for intercom purposes, leaves the video sounding a little dull and lifeless, Ie, not able to hear my motorbikes engine much at all. If both tracks were recorded separately, it would allow the user to mix those tracks in post to create a nice balance.