[Dracarys]

In order to prevent exploiting, I only allow blessing of Clothes, Armor and Weapons and all items derived from these classes (i.e. shields)

There is an extra check to disallow stackable items. What would happen? Well, technically you would have two blessed items if you split the stack. That's the exploit.

PBD's can't be used on stackable items on OSI, by the way. But as mentioned before, you can bless food/potions on OSI.

Containers can't also be blessed with this script (Or on OSI for that matter).