Unfortunately the closest you're going to get to that is the Armour of Light, the tank Labyrinth of the Ancients body piece as that is also an Amano design - alas that too cannot be dyed.

The only other thing I can think of is Odin's armour the Herklaedi and the Dark Divinity Herklaedi, but they too cannot be dyed either. Unfortunately there isn't anything that resembles Firion's gear that can be dyed I'm sorry to say.