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I've completed the main Greek Unicode block, and the Extended Greek block, for a couple of types.
(Actually, I've skipped the Coptic characters.)
Now I'm wondering how to implement the "extra" characters (variants, archaic, etc.) -- and not just leave them in the glyph palette.
Here's what I'm proposing at the moment, with several questions.
Default characters are in the left column, the alternates in the right.