I mean they kinda did that with the Blood Gorgons who's specialty is literally pulling off maoist revolts on imperial worlds, but it was only a single novel
The Blood Gorgons, who value their freedom and independence above all else, refuse to swear allegiance to any patron Chaos God, preferring to serve Chaos in general in the form of Chaos Undivided.
chaos undivided annoys both chaos nazis and the imperium nazis which is why it's the best faction even when they do war crimes
i think they should add sympathetic chaos-aligned factions, it would make the chuds actually start dropping dead from anger
I mean they kinda did that with the Blood Gorgons who's specialty is literally pulling off maoist revolts on imperial worlds, but it was only a single novel