I know that my suggestion will sound very dangerous, but I have a similar issue with my older 1976 Harley Shovelhead. The oil tank is located above the oil pump/crankcase and after a "bit" of time my crankcase will fill up with leaked/bypassed oil from the oil tank.

I realize that this and when it's sat for a couple weeks, I use a cookie pan under my crankcase breather that I ran to the rear under my transmission and then through a 90 degree rubber boot towards the ground. But for long storage, like this winter, I use a hose pinch off clamp on the oil pump feed line.

eBay Hose Clamps

But the scary thing is this, IF YOU FORGET TO REMOVE IT BEFORE YOU START THE MOTOR, IT WILL BLOW THE MOTOR UP...

So I hand a tag on my handlebars next to the start button that says to remove the clamp before starting. Kind of like the red flags sport airplanes use on the pitot tube for the air speed etc.

Based on all the issues that seem to be occurring on the M3W with wet sumping during driving intervals, I would consider some type of a shut off valve for the oil feed line that will not allow the motor to start until the valve has been removed or switched open.

Just a thought, but for just a few buck/pounds, you could stop the oil bypassing the pump and filling the crankcase with oil.

Dan