One solution would be to recognize that equipments in this game are useless from a design standpoint, together with levels and stats, and the PvE should be updated like PvP : removing levels, equipments, and normalization of stats. Nothing will be lost.
And then, equipments would just be appearance. No need for complicated system like prisms, dressers, things you can only do in Inn or whatever. Just equip whatever you want to show.