You could do it easier off the reverse light circuit and just not have the front lights flash.
I was gonna wire a four indicator hazard circuit onto my HJ years ago, and decided not to in the end, with the bits I had it would have been too much messing with the original harness, and I didnt want to run the risk of making a good indicator circuit unreliable.
A flasher circuit tapped into the reverse light circuit where the light and dark green wires come out from th switch at the gearbox is easier and will work if you get the circuit right, but you still need to tap into the loom (it may have been cut at the gearbox already) its only the reverse lights you're messing with then. You wouldnt get front hazards, but the side repeaters would still flash. You may want to use some big fat diodes to stop power going to the flasher circuit when reverse is engaged though.
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