Is using masked layers in a switch layer possible??

[Poptoogi]

O.K. I'm made some eye and and mouth independent of of my characters by using two layers. One layer is the masking layer, the outline of the mouth and eyes and the other layer is the pupils, teeth and tongue. This works really, really well for me because I can swap character faces and use the same animation for any one or any type of character I want. By having two layers that create these facial expressions, I can't seem to make a switch layer for the mouths since they have to be in a group layer to function properly. I want to use switch layers for the mouth because I us interpolated animation when I lip sync my characters. Does anyone know a way around this or any suggestions? Any help would be appreciated!