Check out Tony Athens website for some info on CCV systems. https://www.sbmar.com/articles/crankcase-ventilation/
Also you might find the following article, written mainly about his ideas relating to Cummins engines, but the general principles of what a good CCV system should accomplish apply. https://www.sbmar.com/articles/envir...arine-diesels/
To me, his basic concept of "letting gravity" do most of the work, capturing the excess liquid rather than pushing it into the turbo, aftercooler, and then engine, makes total common sense.
To be clear, I installed one of his Envirovent systems on my Cummins, replacing the Walker Airsep. The difference was amazing. With the Walker (factory installed), my turbo and aftercooler had a fair amount of oily "gunk". With the Envirovent, there was no noticeable oily residue in the air side of the turbo. There was also no oily deposits anywhere in the ER (or on the engine) using the Envirovent.
There is one system on his website for a Yanmar, but it might not fit your engine.
I have no affiliation with Tony other than I have gained from the way he freely shares his knowledge and experience, and have been a satisfied customer.