Way back in the day, art supply stores used to sell wide fan (and other types of) nozzles for graffiti.
They are still available today.
Edit: these are listed as fitting Rust-Oleum cans and say they have a 4" fan pattern.
Yes, $1.40 each for 10, but available through Amazon.
https://a.co/d/07GiayTThey have other listings for 25, 50, 100 caps but I don't know how often you get clogs.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.