Vanity Weapon slot for Priestess of Ra

I always wonder why are we can't equip our Priestess of Ra with Vanity Weapons. I know, the Scepter and the Holy Staff isn't equal but they should be use the same Vanity "skin" just like the axes and swords. For example: Axe Throwers and Woad Raiders use axes while Long Swordsmen and Hypaspists use swords but all of them use swords as Vanity weapons. With the same logic, the Scepters should be use the Holy Staff "skin" as Vanity Weapon.
Here is a little showcase (made with Photoshop):


And don't forget, we can find few Priestess of Ra with Tiki Staff on Vanity Islands. So, this feature is already in the game files. Somewhere. Somehow...