It occurred to me that while I can't properly test the Thien baffle without enough sawdust to fill up the bucket I can test my own baffle simply by lowering it into my bucket.  I did just that, lowering the old outlet port and the new baffle into a bucket of sawdust and other junk while measuring the distance from the bottom of each and the surface of the dirt.   

The regular open outlet port started to suck up light particles of Styrofoam at around 10  cm and started sucking up sawdust at 3 cm.  My new baffle did not suck up the Styrofoam till 2 cm above the surface and even when pushing it into the sawdust it did not suck up any dust.  Now my new outlet is 5 cm deeper than the old outlet, so that is only a 5 cm gain on the Styrofoam.

There is almost no air movement at the bottom of my baffle, I suspect I could drop the bottom two layers of holes to shrink it up without greatly reducing its effectiveness.  I did notice that it appeared to be disturbing the air around it much less than without the baffle, I got movement on my Styrofoam balls almost immediately when using no baffle.

Anyway I may publish the baffle, it appears to be working well, well enough to give it a proper try at least.