I considered trying something similar but decided I didn't want the byproducts contained in the blow-by going back through the engine.

If you were to put a "T" in the pressure line about all you would end up doing is vollying the muffler pressure with the crank in-coming pressure. The crank vent is a two-way valve. As the piston travels towards TDC from BDC air is sucked into the case via the vent. As the piston travels from TDC to BDC ring blow-by and air are expelled through the vent.

Hmmm... After a moment of thought... you would be creating a negative crank vent. In other words, tank pressure and muffler pressure will be forcing air into the crankcase not allowing the crankcase to vent properly. And, when the crank vent draws in air it will be drawing form the tank pressure.

Quite a few variables is this equation!

Since I don't own any Saitos I wonder if that much blow-by normal. If it is new the ring may not be seated yet. If it is old you may need a new ring.

The fuel tubing Jim suggested is by far the easiest option. It will not only divert the blow-by byproducts but also provide a means of lubricating the three front end bearings.