Steve ,
That is impressive because you have tested your mod and it works !
Someone else has described using a catch can as a primary 'trap', ahead of the AOS but your creation goes mush further by eliminating other weaknesses.
I hope sometime you'll find the time to write up a DIY guide for this with photos ? Perhaps when you are traveling you will have time?
The pcv you mentioned - is it part # 06A 129 101 A
like this?
New Crankcase Breather Vent Purge Valve PCV Fits VW Golf Passat Audi A4 A6 1 8T | eBay
For the Catch can, the nearest to your description I could find is this:
Universal Car Engine Coolant Cooler Radiator Overflow Breather Tank Can Cap Kit | eBay
or this:
Chrome 800ml Universal Radiator Coolant Aluminum Catch Tank Overflow Reservoir | eBay
or this:
3" x 9" Polished Stainless Steel 32 oz Radiator Catch Can Overflow Tank Bottle | eBay