Airbrush-size airless sprayer for painting interior trim?
You can switch out the tip on an airless to do smaller areas. The first digit is one half the fan size so a 211 has a .011" opening and sprays a 4" fan, that should be acceptable if a spray can works. It does presuppose you rented an airless sprayer. You may also need to change the filter and use a small amount of flow additive. Ask the rental place for advice and what the smallest tip they have is.

If you own an airbrush there's a chance you may be able to run a detail HVLP gun off your existing compressor. They require quite a bit less air than full sized guns do, and you might be able to squeak by with a pancake compressor if you're not spraying continuously.