I don’t splitting the one connection at the valve cover would allow the PCV to work properly.

You need two openings. One for the PCV to “suck” with the power of manifold vacuum. Another for some means of providing filtered makeup air. Lots of ways you could skin that cat.

I’d probably use the existing valve cover hole to make your PCV connection to manifold vac. Find another place to provide the makeup air.

If you do a web search for “valve cover bulkhead” you will see a number of options for creating such an opening. That could be drilling a different spot in the same valve cover, or perhaps in the push rod side cover……and connect your air filter nipple to that.

Here’s one option I have looked at:

https://www.jbugs.com/product/9164.html

I took a different approach. PCV is located in the front mounted oil fill position. Attached a round, motorcycle-style filtered breather to the outlet of the draft tube. Crankcase vapors pulled from the top, clean air delivered back to rhe crankcase via breather.

1951 3100