This may not be correct here, because of the subject. If so, sorry.
But since giving more classes to races (I would love a Stygian Soldier, since day one), then maybe take off the armor limitations for vanity armor?
It could give more freedom to our character immersion and imagination when we could visualize our character types the way they wanted.
For instance: the pictish light armor (skull face, bones and croc skin, I think) would fit well on a mage type character, don’t you think. And who couldn’t like to see an HoX PVEing spreading fire and slashes in heavy armor? Magic soldier type.
Since Vanity Armor only happens in PVE, I don’t think it should not be a problem for anyone, right? It permits each one to play more conform his/her tastes.
Besides: more armor in inventory and bank, more free slots needed. Ergo, more probable purchases, right?
In the meantime, as for story dialogue to the soldier class for Stygians. Maybe a decent Sound Editor User can do some word montage with the existent voices (thinking Nadini here) to construct a soldier version for stygians. Maybe it’s possible. I did things like that myself a few years back on a Multimedia Course, and I know they do them all the time in Cinema.