I'll go old school and say, for most my projects, a smaller gun like this is right on the money. I use these for nitrocellulose on guitars. I need to go try a top feed, but usually, I get these so cheap, I don't even really worry if they don't get cleaned 100%. As disposables, they work well- and I am thinking HF, but I don't see them listed there any more. This one is more than I'd want to pay, but wouldn't shake too much of a stick at the price.
edit- I recently painted a bicycle frame, and get the concept of the wasted atomization though LOL
edit #2- looking at the prices of the HF gravity feed guns, I don't see how you can go wrong with any of these.
https://www.homedepot.com/p/Campbell-Hausfeld-Spray-Gun-Detail-with-8-oz-Canister-DH550000AV/300775601?mtc=Shopping-B-F_D25H-G-D25H-25_28_COMPRESSORS_AND_AIR_TOOL-Multi-NA-Feed-PLA-NA-NA-Compressors_PLA&cm_mmc=Shopping-B-F_D25H-G-D25H-25_28_COMPRESSORS_AND_AIR_TOOL-Multi-NA-Feed-PLA-NA-NA-Compressors_PLA-71700000052227371-58700005026398229-&gclid=Cj0KCQjwjoH0BRD6ARIsAEWO9Du1KhmwsZKYXHKkUKkb wQYwrQ1bBCzcLnCav3y5oiU1G7QyG2zHhNoaAkRpEALw_wcB&gclsrc=aw.ds