Garlean Third Eye Customization option

[Theodric]

It is impossible for the WoL to be Garlean

A common misconception. The Warrior of Light is already the exception to a great many rules and Pureblood Garleans are not unable to manipulate aether altogether - it's simply exceedingly rare or requires workarounds such as making pacts with Voidsent.

That aside, when people ask for a Garlean third eye option they're typically doing so out of a desire to role-play. Role-players do not often portray their character as a 'Warrior of Light' but simply someone who happens to live within the game world. Be it a merchant, noble, bandit, mercenary or Garlean.