Well, they managed it (albeit badly) for Realta Nua, so they could do it for the anime. I think it does remove quite a bit from the story, but it can be done. Plus, they managed to adapt Zero, and if anything that is worse (HF at least doesn't have children being raped by penis worms and tortured to death by a psychopath). If nothing else they could take the approach Zero took and censor some of the harder stuff for the TV release.