Well, I'm in the office, things are happening, and I am working under a mild pain load. So, maybe its just my distraction.
But for the life of me, I cannot figure out why you are wanting to starve the bearings for oil, and increase the pressure on the oil filter seal to see if it will leak.......
I know there is a bypass built into the filter in case it stops up, but your washer would "bypass" that.
However, somewhere in the back of my mind I want to say there is a bypass built into the oil circuit in the engine that will bypass the filter completely if it gets plugged.
Otherwise, the oil comes from the pump to the filter. If you cut down on the flow from the filter, you cut down on the oil to the engine.
Of course, if you are using the filter for a non-automotive filter, then it makes more sense.........