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You say you found a driver for this camera, but you don't provide a link to it or describe how it doesn't work. That makes it hard to help you.

The OpenCV streaming interface sounds promising. Being able to grab the left and right images simultaneously is a huge advantage when dealing with stereo cameras. I suspect the boundary between the images doesn't move, so if the existing driver doesn't work out you should be able to write one that uses OpenCV's streaming interface. I'd just grab the dual image, split it apart and publish the left and right images separately (with identical timestamps).