Don't misunderstand VSS.  It will only apply shaders to your skin textures, it will not affect any morphs, scaling or physical changes to your characters.  You are safe there.  The problem arises when clothing share the same body material room nomenclature.  In those instances, VSS will exchange the clothing textures for its own built in skin template.  There is a work around, but I will need to illustrate it to avoid any confusion when you actually set VSS up. 

We will need to enforce a rule change so that all your kids are targeted by VSS and not influence any clothing items present in the scene.  It can be done globally if all the kids have a default name or similar name, or individually, which is more work but a better gaurantee that characters themselves are effected and nothing else.  I will try to set something up this evening.