Apparently I need to edit all separate models, textures, animations and vfx for all Ifrit forms, including its Egi and Carbuncle form which takes hell of a time. They even have separate paths for Aegis spell! And using command /petglam you can choose the main tome you want to walk with, but notice that only default Carbuncle has despawn animation and vfx. Egi summons can only fade away.