Then you might like these pickers - designed for non-native user input. (Note that the Latin & diacritics picker probably includes most of what's needed for Vietnamese.)
http://people.w3.org/rishida/scripts/pickers/
Thanks for that, very useful. I was skeptical, Vietnamese having such a wide variety of accents, double-accents, and even accents below as well as above the letter, but I was pleasantly surprised. I think they're all there and any set that includes "the letter O with a little comma sticking out of the side plus a teeny question mark floating over the top" (as seen in everyone's favourite Vietnamese word, "Ph") seems to be pretty much complete.
Thanks again everyone for your help. I'll let you look at the website when it's done.
Oh and incidentally, the Vietnamese Professionals Society are the body that looks after this kind of thing, fonts, keyboard layouts and so on, and they use and recommend Unicode here: http://www.vps.org/rubrique.php3?id_rubrique=91 so they're solidly on board with standards too.
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