Damnit, now you got me curious. Never make an inverter curious...
I think those fricken balloon animal - balloon fillers would work!! (manual pump). Those are basically an in-line pump if you made a loop with tube from one end to another... Cheap experiment. Hahaha I love cheap experiments and recycling crap.
You know, vaporizers work for any kind of herbal medicine, this could really be a interesting method of safe/legal extraction involving no solvents. If it doesnt suck balls.
Hmmm A computer vac is also inline pretty much...