Match Grain on 3D Extruded text in CS6?

How can I use match grain on 3d text in cs6? When I apply the effect to the text directly it doesnt work. I assume I could precompose the text and then add grain to that layer but the grain would extend beyond the text to the whole layer. I was thinking I could make a white version of the 3d text to use as a matte but that would cause crazy high render times with both the 3d texts. Any idears?