Only way to do this is either via 2 addons, one the guild master would run, and one that every member would run, or to scan every guild member, which would have to be face-to-face in-game.
Another possibility would be to scan their armory, and dump the info, but unless anything's changed recently, it can't be done with the new armory.
Either way would be quite difficult, and take up a good deal of time, so I doubt it'll come cheap, if that matters.
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