PRUNUS J525 Portable Radio AM FM with Bluetooth Earphone Output & Bluetooth Speaker Mode, Preset, 2500mAh Rechargeable, Micro SD Playback with Shuffle & Sequential Play, Headphone Jack, Sleep Timer

For point 5, there may not be Line-In via 3.5 mm jack but there exist portable, battery or USB powered AM/FM radios that can output via Bluetooth. Amazon, Walmart, Best Buy all list them. Here's one example: https://a.co/d/0h862F3k (this is just the first that showed up; there are bunches of these). It has both Bluetooth output and input. What I don't know is if the profile is right there o connect to a car?