there's no such thing as [Action] "Change the unit's defense type" to ......
Changing units armor is possible, cause Island Defense made such thing with Demon (You research one upgrade and Demon armor is changed to fortified).
So yea changing units armor is possible.
The ability has to be activated... Used!
But then, how could the item be held in the inventory?
Things will get more complicated if you use triggers.
>.>
I need to take a better look at these things.
Any upgrade can do it with "Defence type change".
I think this is really impossible.
But now I need something similar...
I need a hero to be able to change his armor and attack type.
Armors:
Unarmored
Cloth
Leather
Plate
Attacks:
Unarmed
One-Handed
Two-Handed
Ranged
I guess you need something similar.
I hope that at least the 1.24 patch will open a way to solve this.