Okay, long story short: Somehow i stumbled accross venturi pumps on mcmaster-carr and thought "hey those are kind of neat". Days later, sitting in math class, EPIPHANY. Mcmaster's info said that venturi's could be used for either vacuum or to transport particulate matter. PARTICULATE MATTER = BBS. I've been looking at some internal diagrams and venturi pumps practically look purpose made for bbmg's. They have an air inlet, a suction inlet, and an exhaust port. The air from the inlet generates negative pressure into the suction inlet, which sucks in bb's and then ejects them out along with the air from the inlet.
mcmaster's diagram: The functionality of this design would depend on weather bb's can get through that tight gap, i dont know the dimensions.

This site uses a different design that looks even better. They charge 100$ for 3/8 inlets/outlets though. But the design looks better for bb's
Mcmaster, however has very very high prices. But i can get some of these for cheap on ebay. There is also a veneer floor supplies website that sells them for 42$ (huh? i don't get it either...)
Any1 else think this could work?