I think that's about exactly how I would approach it. Take the best spray gun I've got that can spray the finest line and work at it with that gun and then if necessary go back over with the airbrush. My spray guns aren't nearly the quality of my airbrushes. My guns are mostly harbor freight kind of stuff. But when the day comes that it's important I'll invest more in better guns. Right now pretty much all I do is solid colors so as long as it sprays decently it's good enough.