Here's the thing, when folks come here for help we try to give advice that improves, is cost effective and help the op squeeze the best possible, high fidelity sound their system can muster. What you're proposing is not the best possible sound that can be obtained from a system nor is it cost effective.
It also adds more complexity to the system and most "average users" won't even understand what's happening when they fool with adding an additional center channel (many of which aren't cheap) and splitting the signal like that. It's bad advice, especially is someone is new to hifi audio.