"Venturi effect" for vacuum source...
The lower pressure in the tube caused by the fast moving air from the compresser will generate a vacuum, but not too much.
It depends on the venturi design and the available cfm and psi available.
This technology is used to inflate the escape slides on passenger jets.
Even 2-3" Hg. is acceptable for 1#/sq.ft foam wing skinning.
A vacuum source without any mechanical positive displacement stuff has
got to some merit by virtue of it's longevity.
The way I would use this device would be to plumb the vacuum line to a
'tank' and run a line from the tank to your bag & wing setup with a valve.
Life sucks...make the best of it.