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Single sided matte shader / back faces matte shader

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I'm having a problem with something quite basic. I have a load of objects, spheres say, and inside each one is a smaller sphere. I need a pass where the front faces of the outer spheres is not visible and the back faces have a matte shader. Ie the inner spheres are visible through their own outer sphere but are occluded by the backfaces of the others.

I thought it would be simple with either Two Sided VOP or Is Front Face but I don't seem to be able to hook it up correctly...

Thanks for reading

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In case that wasn't very clear here's a mockup - I want the areas painted red to be visible - so the parts facing camera don't occlude but the parts facing away do

occluding backfaces_painted.jpg

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