I'm as complete a beginner as you guys, but the hoover-thing is something that has been going on for a while, and I've only heard of it. Old hoovers is said to have a reverse-function, so that they blow.
If I had one, I probably wouldn't have built my little bellow.
But I suppose your suggestion would work just fine actually. Might be a good idea to take the bag and filter out first not to waste the energy, but other than that I don't see why it shouldn't work.
It is also said that the millitary has some handy compact forges.