Professional cabinet finisher here…
I’ve never used them, but check for preval sprayers at a local paint store. The are an aerosol with a canisters for you to add your own paint. This might be a good solution for spraying such a small amount of product. I would think you’d want to thin the paint a bit. Under $10 and disposable.
Refillable DIY and Pro paint spray systems. Spray any liquid for professional results. Order Now or call to become a distributor 877-753-0021
preval.com
I you have an air compressor, an inexpensive HVLP gun would probably suffice with minimal clean up. A 1.8mm needle is probably a good starting point for medium/heavy bodied paints. 1.4 for thin materials. Honestly, for spraying some cameras, a $20 harbor freight gun will suffice. They’re not great and rust after a while, but totally doable for small items. HVLP results is more about thinning, fluid, and air settings than the gun itself. I can probably spray out a better finish with a $20 gun than you will with a $900 gun.
You’ll want to do a scuff sand to promote adhesion and using a good bonding primer before painting. Also, if painting dark colors be aware of the fact they will absorb heat from the sun.