I usually have heard ammonium chloride is used in place of the sodium chloride. I guess you may be able to use different variable metals/compounds ions because as far as i am concerned, nowhere in the reaction does the metal ion react...or does it?
Actually no, it mainly consist of nitrogen, ammonium compound, zinc compound vapour. It is not consider as toxic. The reason for me to use fume-cupboard is that burning metal usually produce unpleasant smell and sometimes make me dizzy.
www.instructables.com/id/From-Rubbish-to-Rocketry/