Royal Cooking Set seems to be a definite go so far ^_^
Nidsrule: yes when the chemist defeats *any* monster, the wing effect does trigger. Guess that now you mentioned it, I should change my list too.
Honey
-what kind of bee wing doesn't have bee products...? But I can foresee some people going "psh" at this just because of fish x.x
Bee Sting
-more bee products! plus it helps sinx
Royal/Professional Cooking Kit (I'm personally for professional)
-Encourages cooking, which is actually quite handy if stuff aren't sooo annoying to gather. This is a step in the right direction.
Authoritative Badges
-eh I guess...
Witched Starsand
-Not just the chemists, but it's used in some quests too so in general it helps everyone.
Still skewed towards sinx and chemist a bit... but eh I can't think of anything new either.
EDIT: maybe let red envelope be instead of zeny... easier for scripting that way if all the things from the wings are items I imagine.