Just to confirm what you've been able to achieve, are you using an iPhone with mirrorlink? I thought that was only available to android handsets, would be very happy to be told otherwise.
Im looking to hack my wife's mylink to get it working with an iPhone for google maps and Apple Music, exactly like you have
Id be keen to use the files you worked with if you still have them? Or if you could point me in a direction for the download.