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If the op requires help i can go through this and offer soluton using Kentec sav or alarmsense....will save you rewiring....!!!
Ok not the end of the world, 2 ways to sort this...Used Kentec sigma 2 wire panel, if using apollo smokes change bases to apollo sav, use all standard call points and smokes. and finally wire sounder reverse polarity. Second way change panel to CTEC or Kentec Alarmsense and change all devices to Alarmsense........the first is cheaper, using detection you have....but both will run all on 2 wires.
quick Kentec diagram to help.