Found where Bull stated Home Ground Astral Assimilation would be addressed in the FAQ. Unfortunately that was from before he stepped down, and it never made it into the FAQ.
If as SG states Teotihuacan magicians can be assimilated and Teotihuacan is over 8 square miles in real life and probably bigger in 2075 since people live there again, I think Home Ground can cover the CCZ. IMHO, YMMV.
Looking at you O Great Powers On High from the Missions team that have a better track record on answering things than the rest of you false idols from the uncaring corporate whom I assume are the model for the Big 8's dealings with the masses.