I did the same thing to my Bounder. Took the old 27in TV out, put up a 3/4 inch backer piece of plywood, painted flat black, and then mounted a flat screen bracket to it. The bracket I have has a lock on it to keep the 32in TV from "jumping" off.
I did not hinge the plywood backer board, just cut a nice 2in hole in it for the cables to come thru. I can easily reach behind the TV now, unlock it, slide it up and off the bracket, and then it's just 3 screws per side to back out and that entire backer board comes off.