These venturis are very noisy and they take a lot of air. For soldersucking, you don't need high sustained volume. What you need is a pulse, like the trigger-actuated hand-held single-shot piston pump "Soldapullt", though perhaps a bit longer in duration. I think a small reservoir like a 16.4 oz propane bottle very near the point of use would do the job. It could also accumulate the crud because it's easily and cheaply replaced, and a 16.4 oz reservoir would hold years worth of sucked solder. You might want a larger reservoir mounted out of the way somewhere. Some restriction between that and your pulse reservoir (a point-of-use vacuum capacitor, if you will) might actually be beneficial. You get your shot, then it takes a second or two to suck back down from the larger remote reservoir which is cyclically maintained by the pump.
Teflon tube (drilled rod) works well as a sucker nozzle. You'll want a poke rod to clean it out periodically.
Braid works better for surfacemount, but a sucker really does work well for clearing out holes in thru-hole boards.