Beyond the idiosyncracies of Haitian culture, body sovereign should prevail: if you're in full possession of your mental capacities and you explicitely wish to be zombified, why should you prevented to be?

But as always, holier-than-thou groups and the state who believe they have a God-given right to force their morals upon you or protect you from yourself will probably prevent you from exercizing sovereignty over your own body. E.g. body modification, abortion...