Anyway current Octane exporter for Blender is pretty good. And if you need to customize some changes, the python source code is readily available to everyone. It's not hard at all to incorporate any changes once you know the basic of python programming (and how it's used in Blender). But if somehow you can't afford the time to do it, then this forum is perhaps your best friend though it'll take some time for a newer version to be released.
I have been using the blender 2.5x exporter... and it doesnt work well with octane 2.52... it cant update the ocs file after the first export due to the new nodes / materials avaliable (portals... updated specular etc.etc.)..
If they opened up the OCS spec, sure I would be more then willing to update yoyoz python exporter... but at the moment they have not.