East Gippsland Rainforest
  Conservation Management Network
  To increase the amount of rainforest and associated vegetation types subject to restoration, conservation and permanent protection in East Gippsland.

Leave in the sun to dry and split open

Wash the seed repeatedly with strong detergent like truck wash
(to simulate the action of  bird digestion)

Scatter the seed into protected or disturbed area, for example where blackberry has been sprayed.

Thanks to Ned Ricard of Snowy River Riparian for the suggestion.
(Ensure that you have appropriate permissions before collecting any plant material)