Sounds like a crime against fluff to me.
From a gaming perspective, I think most people would have no issue with your approach, unless you had some Black Legion detachments and some Alpha Legion detachments with the same paint scheme on all.
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From a midnight sky, there is a searing flash, a boom, a brief moment of destruction, and then it is gone.
Kabal of Lightning Strikes - Project Log
Drukhari damage output analysis