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Apart from whether you can mix up a "Naples Yellow" hue through admixture of other pigments, you probably should work on doing so, in any event, if you're at all susceptible or sensitive to toxic materials. Only a couple of years ago I bought a tube of Naples Yellow and was told by the art store clerk that I wouldn't be able to get that much longer, as it was being outlawed. Apparently that didn't happen, after all, as it's pretty readily available still. But depending on the manufacturer, Naples Yellow is a metal based (lead, antimony), quite nasty substance, if you happen to be a life form. I admit that I still have it on my palette, simply out of habit, but my life-form status was subject to debate before I started painting. Still, I should probably find a substitute. I don't know what's in Yellow Ochre, but it seems like regular dirt, right? The kind of stuff we used to eat when we were kids? If you're reading this, it must not have been too harmful. If I hear or find out differently, I'll retract and amend. Virgil Elliott would be the definitive source on such matters.
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