Thanks, but the whole reason I'm bothering with Alembic is I can't afford to buy Houdini FX, so I can't use the plugin
Indie can export Alembic files, so I can benefit from Octane Standalone, but I can't control depth of field.
I'll try going this route (with LUA):https://render.otoy.com/forum/viewtopic.php?f=73&t=49960
Thank you for your help. I hope this will get fixed officially in Octane 3.