I'd make it Crystal Tower-based drops. Since who wants to farm for bind-on-pickup items in a lockout dungeon? If the mats and the end product is not tradable, it doesn't matter how fast I do it. But they can make the difficulty to craft and/or obtain items such that it will equal myth/allagan acquisition rates (without necessarily putting it in the One Toughest Dungeon).
If I can get Myth from WP, then I wanna get those mats from something easier than Coil, too.