Aftermark DVD with MYGIG

Has anyone installed an after market flip down or DVD headrests and and connected it back to the myGIG system. I wanted to save money and get a bigger screen by backing away from the factory VES. I also noticed that the option on the myGIG is greyed-out, thus looking like it can be installed. My final mod (if possible) would be a aftermarket flip down controlled by both the speaker system and the flip down and also having a AUX video channel like the stock VES when installed.