Activating the portal to End with a custom item.

Hi all, I had this idea, replace the portal activation in End, not with ender eyes, but with 12 unique items. So, I found that the portal frame has a boolean state 'eye'. I created a procedure that when I right click this unique item in my hand, it changes the state of the portal frame to 'eye=True', but when I activate the 12 portal frames, the portal itself is not activated. But if I activate 11 portal frames with my item, and insert an ender's eye into the 12th frame, the portal activates. Does anyone have any ideas how to realize the activation of the portal only with my item?