I did a lot of searching here to no avail regarding adding the factory OEM UConnect. I remember seeing that someone wanted to add the OEM system aftermarket and think he gave up after being told it wasn't possible. For some reason I can't find the thread. There's tons of UConnect threads dealing with a variety of issues, but none with what I was looking for.
There is someone (technoteacher) who has successfully done this along with the OEM Nav on the MyLXInfo forums. He lists part numbers and prices as well. I know there are some who would like to do this rather than install the aftermarket UConnect.
http://www.mylxinfo.com/showthread.php?p=928#post928
Rambit