For aqueous electrolysis, don't use aluminium electrodes. You'd only get an ugly mess. Take stainless steel or graphite. Saline batteries contain a graphite electrode which you can extract, if minding the other compounds in the battery.
Electrolysis of salt water: no, you are NOT safe. This is not a matter of electrodes. Salt water electrolysis releases chlorine and hypochlorite, and both are harmful. It's a matter of ventilation and of production rate. A simple base like NaOH would be better.