I understand, yeah that would be a major hassle. I did the same in FFXI, but had to switch gear around myself because I had to switch gear back and forth between mules.

To loosen up cluttering like that, if the widget for gear swapping is implemented, any gear for that class you created the set for should be placed into a 1-slot inventory item with an icon resembling some kind of bag that says "<class> Gear Set." Or, you know, SE can be the same as always and do whatever they can to clutter up out inventory and force us to buy more retainers. I still wish that one day they would remove equipped gear from your inventory instead of have it take up space ... maybe that should be a new thread lol