Why not an external check valve?
Isn't the amount of air/oil vapor to the intake was supposed to be metered? I thought the valve was supposed to do that. I mostly just like that adding an NOS valve back in the intake because it would be completely unseen and already in a pretty ideal spot over the valley. If this NOS valve does not seal like its supposed to (I went ahead and bought it) I might be interested in the external check valve idea. Are you saying just to plumb it from valve cover to intake?
This crankcase evacuation stuff gets complicated. Both sides of turbobuick.com have good arguments for and against the vacuum pump. For now, I lean towards it. A lot of the issues I have could still be inside the engine. For instance this engine has a high mile bottom end with at least one worn out cylinder head. I probably have decent blow by along with worn guides just huffing into the crankcase like crazy which not only crates the crankcase tornadoes™
Turbocharged400sbc which slows the crank down, but also cause some pressure build up that is not fully escaping via catch can. I know it's not happening now because there's only ever fuel and water in it. However, I have few intentions of actually fixing those engine problems.

I will continue running shitty SBEs, so blow-by is just the nature of my game. I may need a little extra help in the ring sealing department especially when I'm running a stick shift and do a fair amount of engine braking.
What confuses me a bit here is the actual steps and order of operations. This Pablo guy is about as clear as his pictures, but one guy specifically says he has a similar system with stock PCV valve and intake hose. Then he added a valve cover vent -> vacuum pump -> to vented catch can. Seems like a solid system. I'm not sure if the water separator between the valve cover and pump is necessary but the amount of water I get running E85 has me thinking it would be smart. Does anyone think this order could be switched up? Maybe valve cover -> sealed catch can -> pump -> atmosphere? I'm sure the pump would appreciate that.