Hi David,
Last year I simply used this:
\usepackage{polyglossia}
\setdefaultlanguage{spanish}
\setotherlanguage[variant=ancient]{greek}
in a preamble for a book with sizeable excerpts of classical Greek prose, and
the hyphenation came out just right.
However, I think after I did this job we have had a major TeXLive move in the
hyphenation files towards UTF8, and I could not tell about possible impact.
I would not know about MikTeX though, sorry.
Cheers,
Juan
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