Jeez, that CMoN article is a hell of a piece of work!
For my own part I have a blend called European Flesh, which is kind of peachy in tone (but with a definite grey-purple hint in the base colour).
Then I have Middle East flesh, which is a general colour for Mediterranean, Latino, Native Americans (north and south), Persian, you get the drift. It's got less peachy-pink colour and more brown-yellow colour than the Euro one but isn't really any darker.
Then for African, Aboriginal or dark Subcontinent skin I usually use one of two of my brown leather shades. There's one I labelled Italian Yew (when I was painting longbows), which is a rich, polished brown I mostly use for good quality leather and then one labelled Chocolate Brown, which is pretty obvious.
If I need to do something outside of those ethnicities I just add a splash of colour from something else, or skip a layer (I recently skipped the dark base coat of the Euro Flesh when painting Viking shieldmaidens).