What if the Devs added another "Clan" for each Race?

[Theodric]

Garleans are a distinct race from Hyurs, not a clan. Plus they'd have to work around Garleans being unable to manipulate aether; otherwise they literally can't use any existing player job.

They're able to manipulate aether, it's just rare. Though the Warrior of Light/Darkness is already many levels of special so it wouldn't be too much of a stretch. The game also draws a clear distinction between regular Garleans and Imperial Garleans. We frequently see major characters team up with the former and working with the latter is something that has happened at least once in the form of Regula van Hydrus.

With that said, adding a third eye glamour would be enough for many of those who choose to role-play Garleans.