Finally got a cigarette-lighter bluetooth/FM audio dongle to work, and plugged it into the onboard car computer (a Radxa 4C+ running Linux; Raspberry Pi-class hardware). Now, the car's FM Radio take take the place of doing musak from a smrtphone, which I can't do because I'm on my Ps. Getting Sherpa tts going is the next job, and then my car can talk to me :D