I'm not trying "pressure" you (get it? pressure? air compressor? never mind...) but if you don't require a big compressor to run air tools, you can get mini compressors just for airbrushing. You can get decent little unit that will run 23LPI with a nozzle pressure between 10-40 PSI which is heaps for a .5mm airbrush.
Before I got my mini touch-up gun I used a cheap airbrush kit for finish necks and worked great for that. I would have to do more coats (poly) than with the touch-up gun, but the results were good.
Also, with the airbrush set up, you really need a space any different to where you'd use spray cans. I'd be willing to say that there is actually less overspray with the airbrush.