How did this turn out? I went through something similar with my DS1000. It's supersport legal so I still had the airbox. Ripped the guts out of the breather and made a custom breather box, but it was too small, so the engine pumped an awful lot of oil into the airbox, which then leaked out all over the engine and exhaust.
This made the tech inspectors nervous, even when I told them it wasn't oil, but "sweat from all the horsepower"....they didn't buy it.
So I went with a second catch can after the breather box, but I got fined for that. So back to the airbox and I just clean out the airbox from all of the oil after the weekend.
One thing we noticed: The bike made 2 more HP with the breather ultimately routed to the airbox. I think at full throttle, the engine was sucking a vaccum in the crankcase.... whatever, it worked, so that's the way we left it.
Finally built another (larger) breather box with some baffles. We shall see.