Mercenaries and PMC
I am looking into start building a fluff army in 40k. The original idea i had was mercenaries or a private military company that secretly works for the Alpha Legion. At first, i thought i use the renegades and heretics list from forge world. I would just not give them any covenant, skip all the spikes and give them purdy uniforms. The good thing about that would be i could use a Malefic Lord as the commander, but apparently, they and the army list is shit so i am wondering if one could use Astra Militarum instead. Obviously, such a group would not use any commissars or priests.
So what do you think and which army list would you choose?
Also, is a Forgeworld renegades and heretics army even allowed to be near a GW event?