I've said this before, but i think major end-game fights should load a "clan limited item" to incentive clans to do end-game fights and know there is a nice shiny prize waiting for them (even though other clans may have beaten them to the punch for loading other limited pieces).
This could be easily regulated by the immortals as these situations would not happen very often. To avoid abuse, you'd put a minimum CRP for the clan to become eligible for the limited clan item piece. Set it at 5-10k CRP, for example.
Fights such as Sleet, Cyan, Shoal, etc. would have this type of situation. The clan would be able to obtain 1-2 clan limited items from each fight. Decay timer set at 4 weeks. If each clan did Cyan, for example, each clan would have Item X because it is a limit per clan.