Unfortunately, it'll ruin the color gamut.
The antiglare BTO option from Apple on the cMBPs were all right (in fact color reproduction is even more accurate than retina - AnandTech has results regarding this), because these displays were calibrated directly from Apple.
Sure, you could calibrate a retina with a matte layer on it, but in the end, it's still not the same as the Apple antiglare display.