"double" outline shader?

Hey there,

We're using a Toon Outline shader to select and deselect certain objects and its working great, but what would be ideal is two separate outlines, one around the other representing different states. I know very little about shader creation and haven't been able to find anything similar online.

Does anyone know if it's possible to have two outline shaders on the same material? There are potentially other solutions but I figure this would be the most elegant if it works.

Many thanks in advance.