despill by defocus background

hey guys

I was wondering how to set up a gizmo that can despill green or blue screen footage by using defocus background as the replacement method. Tommy138 posted his despill gizmo not so long ago; his technique was to substract the red and blue channel from the green, the result was like using compliment color in primatte.
I want to create a gizmo that can replicate primatte method by using defocus background

can any one help please

thank you

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