You can render the scene in iray and the fx in the regular render and blend them together in After Effects
Reallusion has stated that Iray depends on meshes for rendering BUT! Lights are added to the scene! if lights are added and even IBL information is added to the Rendering then please allow the "light" source of popcornfx to be added as well.
This would be greatly appreciated addition.
That would be awesome if they worked with iray renders, bought them both thinking they worked together, big mistake.