I don't know of any adapters that retain rse on the k2's, your best bet is to upgrade the radio to the latest ios and if you want wireless android auto/carplay you can use usb adapters that work very well for that. you can also have the hmi programmed to allow for video in motion if so desired.When I was on crutchfield looking at the kit, seemed like I was loosing a couple things. Mainly the rear entertainment.
Obviously the satellite radio and navigation won't matter anymore. But my kid does use the rear entertainment and the DVD player.
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there are also usb "magic boxes" that allow various video content on the screen like youtube, etc.