I know people will hate me for this, but...
is this really worth it? I mean, as long as a mod has the opportunity to "cheat" for cash-shop items by editing the xml files, Pearl Abyss will be trying to bring it down - this is either an enormous amount of time (mostly yours, BlackFire), or it will have even harder consequences for the users.
Personally, I would love to see your effort going into the Resorepless mod, which does nothing more than remove certain or all armours, when I'm not mistaken? I guess the chance that this will uprise PA is much lower, isn't it?