Are you talking about actual flat finish or non-metallic paints? If flat, your guy can put a flattener additive in about any paint. But if you put clear coat on it, that would have to be a flat or matte finish also, or your flat base coat would turn shiny.
But I think you may be referring to solid color (non-metallic) paint that looks "creamy" (for lack of a better description). I've noticed that Subaru has been using them the past few years and have an orange that looks very similar to the Omaha Orange color that my truck was originally (and will be soon).
Talk with your paint guy. He'll know what you can do.
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Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.