The unfortunate reality with this method is that I will have to create +1, +2…and so on, variants of each armor piece in the game. According to the wiki, there are 559 armor pieces in the game, and if I went up to +10, that is 5,590 armor pieces that need to be duplicated, given their own unique ID, given a unique shop ID, given a text entry for their names, and tested. The biggest problem with this is that it would clutter the menu to a degree that it would be basically unreadable. There is only one param for extra material cost, so I don’t think I can make it so the upgrade costs the stones AND the original armor piece, if I can even set an armor piece as the cost. I haven’t tested that yet. Ideally, there would be a way to hide the upgrade from the menu unless I’m holding the armor piece that can be upgraded into it, but I don’t know if that’s possible.
But yeah, that’s where I’m at currently. Hopefully this is helpful, and I will check back in later. I’ll post some screenshots and whatnot when I get a chance.