It was but I suspect it was doomed from the start because Tzeentch is an exceptionally cruel and manipulative god. Because when Ahriman and the sorcerers launched the spell they had already chosen Tzeentch as their patron god, who sometimes makes a mockery of his followers. The result was the non psykers become Rubricae and the Sorcerers more powerful whose power was tied to Tzeentch thereby permanently leashing the legion.I suspect the Rubric in canon was a semi-failed attempt at this.