I suggest you start off with ONLY a correctly set up timed breather. Forget the other stuff till after then - you may find all the others are not required.Thanks Martyn.
The motor in my bike is also just rebuilt and rebored with considerable care.
It looks like the original breather can work well if set up properly.
One issue might be that the twin is displacing twice the volume of air than a comet.
Should it have a duckbill aswell or is the timed breather larger?