I've found that the body of dubbing can be easily replaced with an appropriately colored ice chenille. If you're not a fan of having to dub bodies (like me), this might be a good alternate. The fly is just as good, and maybe even a touch better because of the added subtle flash provided by the chenille.
Also, I've been asked why I bother to put the zonker strip through the hook point vs. just tying it in zonker style (i.e., an anchor point at the hook bend and an anchor point at the tie off for the strip). The reason is one of balance....with the strip impaled on the hook and then lashed down by the ribbing, it lies very straight behind the bend. When tied in zonker style, it tends to roll this fly a bit, regardless of the strip length.