Arelith

You get -yoink with Sinister Call. You get -ward (and a better-looking one, at that) with Glyph of Forestallment. If you go Unseelie Fey, you get the double dominate of Epic Spell Focus: Enchantment.

As such, I do not think it is out of line for you to get the ability to produce illusory clones when you take Eldritch Veil as a warlock, or have it unlock that for you, so long as you have GSF: Illusion already.

My reasoning is that warlocks get a lot of cookies, if they take other routes; unfortunately, if someone is going all in on illusion (say, for night hag), their capstone ability is just.. Greater Invisibility, for a minute. Arguably has some mechanical uses, but not that great of a payoff when you consider what others get.