Actually, I was going to suggest something like that. It would give you enough strength as it would be anchored on to the studs. I guess the key would be finding a way to make it inconspicuous. IF you had access to the wall from behind I guess you could mount wood framing that way too. Then you could just drill into it like it was a stud. I can imagine what I'm getting at, but I might not be explaining it very well.

-Nick

My M60's make me listen
My M80's make my ears hear
Either way - I'm not deaf anymore