find a tiny tank, or use a small asprin bottle, and fit it with a tank plug. use 2 lines, fit one with a clunk and inside line. Run the vent tube from the engine crankcase vent to the vent tube in the small tank, and run a piece of fuel tubing from the clunk line to where you can access it.
Someone clarify for me. 2 lines into bottle one is vent terminating high inside the bottle. 2nd line with clunk going to the bottom of bottle. This second line exits the bottle and is routed out as per the picture. Now my confusion. 1) If the clunk line is sealed to stop leaking the engine vent is blocked; 2) If the clunk line is left open to vent then as soon as the bypass oil fills the bottle to level over the clunk then their is a retriction of the vent, the air must buble up through the oil.
Liked the idea enough to put a small bottle with some porous foam inside, laying on its side with intake in the cap and the outlet line coming out the high side and routing to a small diameter plastic tube running through the fuse and exiting aft. This is one a SPAD Tensor 4D oversized with OS 52 FS