A windshield is bad enough but a seven inch TV?????????? I can not really talk for if you add up all the cameras I have on my bike it will come out to more than seven inches.
I love my 7 inch Nexus tablet, use it vastly more than the giant iPad, but mounting it on the bars... naah. iPhone, lifeproof.com IP67-rated case, RAM-mount X-Grip and the Tomtom GPS software and poof, GPS and music on the go.
I have the same screen. If you are interested in relocating your ignition switch let me know cos I have made loom extensions. You could then mount the flat screen TV behind the screen.