OnObjectEquipped, OnEquipped, OnContainedChanged

Potion base objects include all potions (foodstuff, drinks), a problem for OnObjectEquipped. HasKeyword on the akreference would solve this, except the potion has been consumed when the event runs. "None" of course has no keywords and so will never trigger the if statement. I can't even get that far with the other two options. I've dug through the CK  home site as well as forums and can find no solution for this. What is needed is an event that can identify when magic effects, hopefully with particular keywords, are cast on player when a potion is consumed.