So, I have a question: can you diplomacy intelligent items so that they don't try to possess you? I'm not talking about forcing them to change their alignment, just so that they will go along with your plan.
Let's say you have an arrogant magic sword that always wants its owner to be in charge. You aren't the party leader, but you are doing everything else the sword likes (your goals generally align and you two don't have an alignment conflict.) Could you try and diplomacy with the sword at the start of each day to convince him that this is the best setup so he doesn't try and poses you?
If so, what would be the Starting attitude of the item, unfriendly?