I don't think there is any saving them to what they were before or even close to what they were before. I'm sure they're zombies in the first place because a good portion of their gray matter is dead, their ain't no coming back. Besides could you imagine having to live with what happened to you if you were to be 'saved' and regain some sort of consciousness and have to deal with the shit you might have done to others. Would your pain receptors be healed and you're suddenly in agony because a lot of your flesh had been ripped and torn due to your mindless shambling, walking into walls and scraping at doorways for your next meal. You would be dealing with severely mentally and physically handicapped 'has-been' people screaming in agony. I think you're wayyyy beyond the point of no return. I see no point to being 'saved'.