Mike, air dusting is simply forcing air into a textile to remove the dry soil. Sometimes although rare I would vac a rug first but forced air will always remove more than any vac will do, badger included.
A badger is far easier to use than forcing air but too much money for what it does. Having said that, if you arent going to saturate or immerse clean then they would be of use. But still not as good as forced air, just easier to use.
With the type of cleaning that I do even without vacing most if not all the dry soil and any type of soiling is removed in the clean.
No I didnt get the air wand but my next visit to the states I will remedy that.
Maybe get a few of them if others need them.
Standard wands too for that matter.
As to the compressor. Well contrary to popular belief, the bigger the better as you get through a lot of air very quickly. I use 2 compressors so one is always on charge. Get a big one anyway so you can use it for other things too.
Having said all this, there is nothing better than a good dusting machine. Only I have never seen one in this country and the one I used in the states costs many thousands. It will de-dust till every bit of dust has gone. At least the particles that can move have gone.
Best, Dave.