Have you considered a passive sound bar? For less than ideal room layouts, I have LOVED the RBH Ultra-3. Super low profile, can be custom cut to match the width of your TV, and sounds awesome. Needs a receiver to power it of course, and likes to be paired with a good sub, but it really does sound great.
There are some other good 3-channel (LCR) bars out there, but the RBH is the one that I found myself always going back to.
You may also think about considering one of those drop down TV mounts that are made for TVs over fireplaces. It can be a good compromise. I'd then mount the bar directly to the bottom of the TV so they'd swing down together.
Lastly, judging by the pics, make sure to have the builder toss up some extra wood behind the TV location. Extra 2x4s or even better, a thick, solid piece of ply so you can just slap that baby up anywhere.