Maybe the vendor can sell tmog options for all difficulties of legion items? (normal and heroic having double the cost of lfr and mythic having double/triple that of norm/heroic).
So for example, lfr ...
This is a suggestion to add rings to the custom event gear vendor, maybe the world quest reward rings could work, and you could replace the cloaks that the vendor sells with them ( because of legendar ...
Topic: 
World of Warcraft
