I said before the smart way is to sddress the problem. Yes, it stinks but everything points to a ring sealing issue. It's not designed to hold pressure in. It's designed to NOT HAVE PRESSURE in the crankcase. The more you have, the more issues will be with ring seal (AKA vacuum pumps for race engines that encourage ring seal...) I dont think you'll be able to seal it up. Plug all the obvious points and it will start pushing out the rear main and gaskets. I wish you luck, but I think it's a fruitless endeavor.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.