This is the best bluetooth adapter. https://www.amazon.com/gp/aw/d/B0769DXZTV?psc=1&ref=ppx_pop_mob_b_asin_title I 3d printed a mount for this in my mini. Signs great and inexpensive.
Here's my setup:
https://www.amazon.com/TaoTronics-Bluetooth-Hands-Free-Microphone-Cancellation/dp/B0769DXZTV/ref=sr_1_6?ie=UTF8&qid=1521574011&sr=8-6&keywords=bluetooth+aux Bluetooth in aux port with satellite controller and microphone. Has physical buttons and a 3M adhesive for affixing it to your dash.
Bluetooth autoplay music a simple app that does what it says on the tin.
Spotify for the music. "OK Google, play ____" works fine.
I do not even take my phone out of my pocket. Before you try this, see if your power source (the cigarette lighter?) turns off when the ignition is off. if not, you'll have to plug/unplug the thing every time you get in the car and that can be annoying. My honda turns it off, so it's perfect for me.