Well as a general rules Juanjo is very very rarely responsable for the octane limitation. often it's because octane core doesn't handle things that looks quite obvious for us Houdini users.
We are lucky to have juanjo has the houdini plugin developer because he does an impressive job both for the dev part and answering our questions on the forum.
you can also create a ROP network with a merge node that combine your mantra render as a pre-process, and your octane render.
then when you lunch an octane frame it will automatically process the mantra pre-pass.
Cheers