I personally was hoping to find a decent plug and play video module that just has it's composite video in's. The oem tv module is useless as there is no analog signal anymore and as for any other type of module like the sirius i have not seen or looked at. As for mounting the tv tuner module. There is a bracket available to replace the one that holds the nav for 3 things intended for tv module navigation and bluetooth. It's on REALOEM.
I looked into the TIS for removing all the parts of the tailgate. As pictured on the realoem picture i previously posted the $75 #16 part is just the dark grey strip with 2 light housings and the door open trigger. It has one connection in the back next to the right light. So it would not be very clean to modify this, hoping also that the wires going to the right light can be disconnected and the housing easily cut out. I compared it to the TIS on an e46 and e53 they are all very similar but the part is so much harder to get to with in an x3.

Lastly to remove any of these parts and to wire the cable the trims need to be removed by removing the clips that hold them with the wedge tool. If anybody has any experience with removing the tailgate trim on the interior or exterior and has any advise on blindly unclipping the parts, please let me know.