Sorry not sure which pipe (and which valve) you mean?
Do you want to convert to an open vent system and block the original return to the intake?
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Yes I want to block off the pipe that goes into the black valve on the air intake near the turbo and just take the rocker cover pipe to the pro 200 and then return oil to the turbo oil return pipe only.
Would this be ok or does the air pressure from the motor have to go somewhere other than force itself back into the oil pipe?
If you block off the air outlet from the ProVent your crankcase pressure will increase until 50 mBar and the valve in the cap of the PV will open and vent to the engine bay. If it didn't do that the pressure would continue to increase until you blow all your oil seals.
There will also be a vacuum at the air inlet to the turbo that will help draw the vapour through the Provent.
Western filters on eBay sell them. IIRC about 20 bucks.
Done and dusted....went with manual drain, pretty happy with the layout of the hoses.
https://www.aulro.com/afvb/images/im...016/08/775.jpg
Can you let us know how much oil it collects ( if any )?