yeah this is a nice idea. For Chops it could use a combination of Armory stored data and Character Profiling from the in game mod.
This would almost certainly require that you turn on the Armory updater for your guild roster. Then I think it is a matter of building a query and display mechanism that shouldn't be extremely hard.
-- Six Demon Bag Jack Burton: Hey, what more can a guy ask for? Egg Shen: Oh, a six-demon bag! Jack Burton: Terrific, a six-demon bag. Sensational. What's in it, Egg? Egg Shen: Wind, fire, all that kind of thing!