Hi Useful',
You are nearly there, but if it were perfect, what would you have to talk about?
There has been so much talked and written about breathers since the bikes were in production that the solution is definitely out there, and is probably on this forum.
First I'd recommend searching past threads for a variety of opinions. You may find you need to answer some questions, like what size breather pipe do you use and a how long is it? - the idea being that perhaps it's volume has to be able to cope with the engine displacement without pumping out of the end. I think that was why Know Thy Beast suggests pipes to behind the pillion footrest.
My own thought is that the breather developed decades ago by Mac Read is the cure for all problems. It is disliked by some as it adds an external pipe, the so called elephants trunk, vertically from the ATD cover. This has a shuttle valve (PCV?) close to the cover and the blown gas goes to separator chamber which has a capilliary tube for oil to be sucked back into the D breather cap. The exhaust from this separator is a short oil free pipe. This is used with the timed breather outlet blanked.
There are other breathers also called elephant trunks which aimed to copy Mac Read's but not all were successful.