A p3a mod that replaces files in /dlc works, but not a mod that adds files. If I put in a table /dlc/text/0176 translating the certain magical index dlc (that is already in System.bra but locked by the .exe), then the new text appears. But if I add a new DLC that did not previously appear in the game, that does not work with p3a. It does work if I just put the files loosely in the TXe folder.
From Discord: