I have a Hellknight wizard who has one level in the Hellknight Signifier PrC. I'm having some trouble figuring out the PFS legal way to handle upgrading my bonded item. As part of the PrC I get a Signifier Mask that, as far as I can tell, is a non-magical head slot item. After I perform the ritual to make it my bonded item, can I then upgrade it so that it functions as a specific head slot item, say a hat of disguise?
If I can I'm assuming that I need to:
1. Choose an item with a base price allowed by my Fame score
2. Spend the gold to pay the crafting costs
3. Make an appropriate spellcraft check to craft the item
I looked through the forums but didn't see anything that addressed upgrading a specific item as opposed to bonding a new item.
As a follow up question, assuming that I can upgrade my mask in this way, is this a one time decision? Or can I later scrap the enchantment that makes it act as a Hat of Disguise and pay the costs again to make it function as a Helm of Underwater Action?