The difficult thing with the APA and ABA is that they have a tendency to go off of precidence. Meaning, if a breed introduces a new variety, than any breed coming along later with a variety similar to that already accepted standard will be expected to conform to that standard as much as possible. The arguement is that it makes it easier to judge when breeds have some sense of conformity in variety color, and aids in despelling confusion. So with that in mind, unless our color is completely different from all other varieties, we will be unable to designate a new color name for the variety. If a color fits within a "family" of colors, then we will be required to call our standard by a color name from within that family as is already designated by the APA / ABA. In this case we've Birchen or Grey to choose from. We are given wiggle room in how we exactly define that color within our breed. We see this in the Silver Penciled variety of the Iowa Blue. In this case we called them by the Standard name that they most closely resembled and were clearly of the same "family" and then we altered that Standard to reflect the appearence of our birds. Whiter heads, stippling, shafting, whiter hackles, blue sheen, etc.
Does that help?