1) As far as I know, what you are wanting can't be done. At least not without doing a serious science project - I have some ideas but see comment #2 below.
2) It doesn't make any sense to do what you are wanting in the 1st place.

I mean if you are using the crappy speakers built into the TV, with the tiny bit of power they have - WHY would you want to even try and throw surround sound speakers into this? Just doesn't make any sense. If the answer is "because the customer can". Well, they are stupid and I wouldn't touch it with a 10' pole.

They already have inceiling speakers anyway. Why are they opposed to putting a sound bar, or in-wall speakers, or even some more in-ceiling speakers to do it at least 1/2 arse correct?
I'm just really smacking my head trying to understand why someone would want to do it this way.