Automatically Redirect Car Radio Bluetooth Audio Back To Car Speakers Rather Than Into Hearing Aids

Hello,

My father-in-law wears hearing aids. Is there a way to automatically move audio from his hearing aids to his car bluetooth when he is in the car? It sounds like his iPhone aggressively grabs the bluetooth audio from his car bluetooth to pipe into his hearing aids. When he is in the car, he would prefer the audio play normally through the car speakers.

I know there are toggles to choose the bluetooth connection manually and even in control center, but was looking for an automatic way to do this via a Shortcut or some other preference setting.

Thanks in advance!