I usually have Bluetooth headphones paired with an iPhone while I’m listening to music. However, now and then, I use the Voice Memos app or another app that requires a microphone. I only use those apps for a minute or so, then go back to listening to music through the headphones.

The headphones have a mic, but I prefer to use the iPhone’s mic with those apps. However, while the headphones are paired with the iPhone, the apps default to the mic on the headphones. Therefore, whenever I use those apps I disconnect the headphones (by turning Bluetooth off), then I connect them again after I’m done using the microphone.

Is there a more practical way to do this?
Is it possible to automatically shift to the iPhone’s mic instead of the headphones’ mic for selected apps?