I wasted a good two years of my life trying to do this. That is how long it took me to face reality: sound quality standards of what is "good" for HT are nowhere near as good as stereo. What really is the point of HT? To enjoy a compelling motion picture experience? Or to have lots of speakers and amps and stuff?
It seems to me the definition of HT has been twisted from Home Theater being a cinema quality experience at home to HT being 7.2 channels.
Don't make this harder than it is. Give up on the multi-channel part, watch movies in stereo. All problems disappear.