Octane Stereo: This seems like a gimmick unless I'm missing something. Can't render left and right eye separately and I can't find a way to tell if this simply rotates the cameras or whether it adjusts skewed frustrum / axis offset.
Overscan / parallel cameras: This kind of works so that I can set the convergeance in post, but there's no good way of previewing this in Max, just have to render and hope that in post it will work. This also means I have to render more of the frame than I need.
'Physical' lens: Creating a 3D lens with a specular material with correct IOR. This seems like a disaster of an idea to me for many reasons

Are there any other ways of achieving this, or am I missing something with Octane's stereo features?
I guess the issue with skewed cameras and Octane is that GPU renderers don't like this kind of non-realistic approach? Vray-RT and iRay also don't render skewed cameras.
I'd really love to work with Octane on this animation so hopefully someone can help.