I think stanron (and I) were just trying to keep things simple, ie. AEIOU rather than suggesting other letters may not be used as vowels. I think my "crwth" is the only one entered here that doesn't use the "y" but even there, the Wiki article I linked to says: Like several other English loanwords from Welsh, the name is one of the few words in the English language in which the letter W is used as a vowel. cwm is the only other with the W I'm coming up with at the moment and that's 2 letters short...
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