[Q] Disable Bluetooth mic for Moto Voice topic

In Google Now, there's an option to disable "Bluetooth Headset - Records audio through Bluetooth headset if available". Doing that allows me to trigger Google Now in the car (E92 BMW) where it does not support triggering Bluetooth mic/Call button press pass through. Wondering if there's a way to do that with Moto Voice.

Essentially now, once Bluetooth is paired, Moto Voice routes all audio and mic input to the Bluetooth system. I want it to work like Google Now - output goes to Bluetooth A2DP but input stays with the built in mic.