S550: A SplitView Saga

The short version: my S550 came equipped with SplitView, but by the time the car came to me, the accompanying wireless headphones and remote control were missing. I've concluded it's not worth replacing them, because (a) an iPad is way better for video these days; (b) a previous owner already "unlocked" the screen so that it displays video to both the driver and passenger; and (c) sourcing and programming the headphones and remote would probably run ~$360, which ain't worth it. Now, the long version. What is SplitView, you ask? It's an option (sticker price = $710) that allows the front-seat passenger to watch video (like from a DVD) on the COMAND display, while the driver sees a different image (like navigation) on that same display. Mercedes explains : Two sets of pixels can be displayed, and a mask on the screen filters out one set or the other, based on viewing angle. The COMAND controller determines the driver's content, while the passenger uses a