Merkury

Hi everyone, I have already did some extensive googling on the subject, but haven't reached any conclusion yet on this subject. Since every car is a different car (as far as trim levels and optionals are concerned) I'm opening this thread hoping someone can shed some light to me in this matter. I have a 2013 Superb II (pre-restyle) equipped with a Bolero unit and It has a bluetooth module aswell. Problem is, the touchscreen is pretty much dead aside from the lower right corner, which makes it extremely annoying to interact with (basically just the physical buttons and through the maxidot menu). It suits me well enough as I don't really mind for the navigation system but the touchscreen not working annoys me. Parts are somewhat rare and expensive and having decided to import a unit, I would rather retrofit a Columbus system (which if I did, I would like for the navigation to work, just for the sake of it). From what I've read there are more than one versions of it, including one with a revised touchscreen. Problem is I can't really get to the part number of that version, which brings me here. I'm also concerned that the bluetooth may not work since I've seen applications where the bluetooth module isn't present (the BT audio option I have in the media menu isn't present). Also, from what I understand, I would have to get the original GPS antenna. Can someone help me with this? Thanks in advance!