In the above I think you'd want to get rid of the t-piece from the inlet manifold vacuum pipe to the air filter, as it will essentially be a vacuum leak and will be bypassing the throttle body. Instead you could just blank the manifold like in the autospecialists kit above. However, the PCV valve on the lower vent needs the inlet vacuum to work properly, although it might still work without it.

Personally I would just use the catch can with the cam cover vent as that is what causes the dirty throttle body.
For a boosted car it might be a different case but certainly on my car most of the oil mist comes out of the cam cover vent, and hardly any oil comes from the PCV lower vent which has a baffled oil separator before it.