If you want to play 'Zombie', you will for sure need some teammates with poison wand or skills to heal you, if necessary. You would also need people to caste rain, to prevent fire of blowing everything up. You could also use poison error and grenade if there are. And all your food needs to be poisonous for sure. Also you could quaff poison flasks. But the main problems with zombie remain 'fire', perhaps counterable with the demon trait and a lot of fire resistance and healing abilities skills, who will kill you if you are a zombie.
I wonder how decaying touch would work on zombie though. Will he still get killed by healing or would it turn it into a real heal because it turns it around?
I would really like to experimet with those options, but playing dozens of hours the same and the same just to reach this state, would burn me up. xD