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I feel your pain....pressure testing the S63 system looks like a total nightmare. Pressure testing each charged air component is the way to go. Though you can only do this up to the throttle body. Anything after that will give you false readings because of the intake valves. Never at any point are all intake valves closed. This is the reason why during walnut blasting, it's necessary to trigger the starter to close the valves in the port that's being cleaned.
As for the CCV line connected to the intake manifold, it does have have a check valve for both banks that are on the driver side. You could remove this piece and seal off the necessary ends and pressure test the check valves.
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