Not an alarm guy and also currently installing a new panel ELK from old Napco. Did you already buy the Smokes? If not, can't he use 2 wire smokes thus then running them in series and end in a loop back at the panel? I am using the System Sensor Cosmo smoke/CO2 detectors. Which uses the module so panel thinks its a 4 wire smoke zone anyway and can be used on any zone vs the limited 2 zone.