Not sure what your intentions are, and I can only talk about petrol engines, but it sounds like you're modifying the crackcase ventilation.
The idea is that condesated liquids drain into the sump oil via the bottom hose by gravity. Evaporations are drawn by manifold suction and burned away.
The only benefit of a catch can which I can think of, is to collect the condensate instead of returning it to the oil. The top and bottom hoses vent the same space (the crackcase), so you'll need to plug the bottom hole somehow, and duct the top one to the top of your can, and vent the can to the manifold. What your can needs to do is ensure liquids fall into the can and not aersol themselves into the manifold as that would be bad news.
In that regard, a can which isn't regularly emptied is far worse than what the car currently has. I doubt there's any measurable advantage. But good luck with your project.
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