alright so i am a bit late to this but i have the same problem sort of.
i have the same stock pop up display, but it all works well(even have an 08-09 xanavi sat nav disc for japan)
since im in sydney it seems that it would difficult to find someone who could actually do the work, but im wondering if a dvd reciever such as this jvc one would fix the problem of no cd/radio/dvd. i can live without sat nav
http://www.jvc-australia.com/JVC/client/c_...&prodID=480 model - KD-DV4506
thanks