I did not think of this... Unfortunately I guess it's not possible to have both. The amount of levels would have become too big. And people already complained about the old beards category because the reason why some beards shared the same layer and other did not was not very intuitive. This is why I chose the upper part / lower part split.
A solution would be a layer system like with the freestyle collection shirts, but the coding for this is pure horror and I swore to never do it again for another category
But since the SP-Studio will need to switch to HTML5 soon a convincing layer system might be easier to include there.