Yeah, single-stage is limited nowadays, and the old toners (including pre-VOC basecoats) often don't exist any more either.
I can't think of any car in decades where I didn't have to tweak the formula to get the color right, including a finer metallic.
Heck, back in the early '90s we had to start with a Mitsubishi color and tweak it into a match for Q5 turquoise.
FWIW, some paint manufacturers have a better color library than others.
Q1 is iridescent, meaning it changes hue on curves & details like the 68-69 B "eyebrows" on the fenders & quarters.
Several if not all Mopar metallics of that era were iridescent.