Work on my script to export particle geometry to a text file is almost complete. It will take each particle and convert its XYZ / rotation details into a series of matrices that can be pasted into the scatter node. Not very nice but it would appear as if this is the best that we will be able to mange for a while.
I can't believe that there is no way to hack the .OCS to include the correct XML required for the placement / scatter nodes. If this is the case then it would appear as if the alienation of blender users from Octane has begun.