I just installed a wireless CarPlay in my 2015 Mini with 6.5” screen. It’s important to distinguish which screen you have before purchase. I ordered mine on AliExpress and it arrived in 16 days. Here is the link
https://a.aliexpress.com/_mr5Ekt5 the seller is very helpful just message them they will walk you thru it if you have any issues during the install. I also uploaded a video on YouTube if you want to tackle this project.

 

Well done video. I can't see myself doing this myself, but very helpful for those looking for information.

 

I did the exact installation on my 8.8" NBT screen, I'm toying with the idea if it's possible to have touch screen install now.