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Well, if you were only trying to plug one hole, you could drill the feed side larger, stop past the intersect point, and install the press in plug from the "safe" side. But then, the "dummy" hole would still apply oil pressure when the main saddle lines up.
Do these things have fully grooved mains?
I would really like to see an oiling diagram of these engines.



The one I pulled part had 1/2 grooved mains.
Don't know if I'm reading you right but my pressed pin would allow oil to both sids of the crank. I would just eliminate the drilled centre.
I would also open up all the cross drilled and mains to 1/4 inch.

I believe the oiling system goes this way.
Oil pick up to filter to crank. Crank to cam, cam to heads, heads to lifters.
Matt