They could just add in the functionality of upgrades transfer via the same method with their wardrobe. They only need to add another button for it among the option since the functionality already exist, it shouldn’t be too hard to implement it IF they really wanted to.
I was thinking this whole wardrobe feature would be like Lord of the Rings Online only a step up since your saving a copy of the skin of all the armor you destroyed / salvaged but no it’s actually 2 steps backwards compared to the armor skin mechanic of LOTRO at least there they don’t charge you anything to change armor skin you just put it in a “skin” slot a sub window that mirrors your equipment and it only affects the look of the item and then you’re free to dispose said armor you’ve copied the skin.
I liked the old transmutation stone mechanic better at least with it i still get to transfer runes/ upgrades around.