You could, but it still won't be 7 ch and you may have cancellation/comb filtering issues running dual speakers on same channels like that altho I wonder if the effect would be lessened with a surround channel as compared to one of the front channels.
"I realize that somebody playing free music isn't as commercial as a hamburger stand. But is it because you can eat a hamburger and hold it in your hand and you can't do that with music? Is it too free to control?" - Don Van Vliet (aka Captain Beefheart) discussing commercial success in the music biz