Sticking with a restricted colour palette is the best move Steve. Once you start to over-think paint colour, therein lies madness.
Despite being a time-served graphic artist, I can procrastinate for England when it comes to choosing which colour to paint anything.
I tend to stick with a limited range of colours from the RAL range and usually make a perfectly good paint decision early on in the process. But then I foolishly go back several times over the months to waste my time looking at postage stamp sized RAL paint chips online and change my mind umpteen times - only to end up going with my original colour choice in the end.
I'll admit to having purchased a good many mixed-to-order rattle cans of RAL paint from my usual supplier in Northern Ireland and the cans have never been used. Still have a box of these unused rattle cans stashed somewhere in my storage facility. The difference between actual rattle-can paint and colour chips viewed online can be disappointingly poles apart. I'm sure those Irish folks send me entirely different colours sometimes. I reckon there's definitely a market for miniature 'tester' cans of spray paint, same as those tester pots of household emulsion paint, to help avoid costly mistakes when it comes to colour selection.
I like your idea of a 'deep yellow'. Pinstriped, of course. RAL do a greeny/brownish yellow colour, aptly called curry, but baby pooh would also be descriptively correct, which I've always wanted to use on a vintage themed build. Reminds me of one of Harley's early colours. Vintage bikes I've seen painted in a similar colour look 'right' for the period.
