BT Headset + AudioInjector <--> Motorcycle Radio/Nav

[AllanN]

Hi All -

I've got a project/idea that I'd like to make work but am looking for thoughts/guidance from others. I've got a motorcycle with an entertainment / NAV system but the manufacturer hasn't made it easy to hookup to a Bluetooth headset. The entertainment system has a connector for a wired headset (left/right speaker output, mic input). My thought was to wire up a RaspberryPi + Audio Injector Zero sound card to bridge a Bluetooth headset (HFP/HSP/A2DP) to the wired headset connector. Where I'm stuck is how to wire things up. Where/how do I connect the speaker outputs so that they can be used as sound card audio inputs? Where/how do I connect an audio output from the sound card that can be used as the microphone input?

Thanks!