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We are setting a book with A LOT of different Native American languages -- Hopi, Navajo, etc. etc.
If you make a general word list (language unknown) and avoid certain letter pairings as hyphenation points, not many choices remain -- for example, ngw, ngy, ky, kw etc. are single letters in Hopi, and ay, aw, iw, iy, etc. are dipthongs.
But it occurs to me -- why can't you always break at a glottal stop? there is a pause in pronunciation there anyway. Did a quick search & found nothing either way.