You can also change ur bot type to one u need, not necessary to save the other set, u just use a TC with the armor equipped then u have the armor in other bot type. Its rlly useless get a different set for each bot type if u can change it too using a TC, not necessary to save the other set, or why not make that set tradeable, so all the people can change it for the part of the bot type they need.
Or, maybe, make another trade option only for those parts, only u can insert parts of thats set, no other items.