Pogre,
you can use bookshelf speakers, you don't have to use two center speakers.
I recognize that the means/setup I posted in the OP is complex, (this is why I mentioned the av receiver with two center channel connections to make it more user friendly) but so was the computer, calculator, etc .
the setup I described in my op allows you to "squeeze" the most out of your system "utility" and "enjoyment wise".
I addressed the "sound" dilemma argument in previous posts. (soundbar, lobing, etc.)