Permanent versions of the temporary titles (like “Slayer of Stupid, Incompetent and Disappointing Minions”, one of my faves) would be neat to have! Blizz has been pretty stingy with titles in general so it’d be nice to have a few more of them lying around, especially if they’re already something you can get in-game.
I think just about any type of gear ought to be cosmetic, at least in the long run, aside from class sets and stuff like heritage armour. I’ve got a thread about that sort of thing on the CC. But even without lifting all transmog restrictions on armor classes, yes, I think these sets would be nice to have as cosmetics!