I haven't used PSP since the early '90s. At the time, it didn't do what I needed it to do and Photoshop did, so I made the switch. I might take a fresh look at it...what features make it most attractive to you?
You said you'd seen several other yellow 'birds? Other than the car show photos and a magazine cover, I've never seen another yellow 'bird. Mine is "Goldenrod Yellow" but an early '80s repaint was not a perfect match. It will go back to the correct shade in a few years.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching