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Cartoon Eye Rig

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Hello, 
I am currently trying to recreate/adapt a cartoon eye rig in houdini with help of a blender tutorial. Its basically 4 different spheres all controlled by a lattice to get the cartoonish transforms. Only exception is the actual eye geo where only the sclera part is deformed by the lattice (with a point group)!

Now I am at a point in the tutorial where the Iris and Pupil parts are supposed to be pushed out closer to the surface of the cornea as soon as the eye rotates (pic2).

In the blender tutorial this is done with a hook modifier. If I understand correctly its more or less the equivalent of a soft transform on a point group in houdini. I tried different kind of approaches with constraints, expressions and VOPSOPs but I just can't seem to get it to work properly.

If anyone has any ideas on how to do this I would be very thankful and glad to hear them!

Maybe someone knows the original tutorial?

Link to the blender Tutorial...paid so unfornately not much to see

EyeRig_01.PNG

EyeRig_02.PNG

EyeRig3.hipnc

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