Check out the white paper again - they made wound meshes in Maya using a high res mesh of interior organs which they projected onto a texture then formed around the high res geometry to give it shape. They definitely do some sort of wound-mesh spawning - the vertex shader only masks out the ellipsoid area (sphere for now in mine).
Since it all happens in local component space, as long as each material has the functionality and is being fed the same point, it should end up masking the same area. Plus the wound mesh would hide that area anyhow.