[DrMagical]

Android Auto not supported still although as you say has Spotify native and Alexa integration native. I've also seen people online 'hack' the infotainment. One bugbear is Apple Carplay is great but only shows 4:3 ratio even if you have the current widescreen infotainment display (level 3) but I have seen Ebay purchase hacks to enable widescreen Apple CarPlay.
Anyway answer to your problem is upgrade to an iPhone, you're getting a stylish car so get a stylish phone!

 

[DrMagical]

Pretty sure Alexa is standard on all Minis (activate in the Mini connected app).