How can additional nodelets be attached to the stereo_image_proc's nodelet manager in Diamondback?

I'd like to add in image processing attached to the `points2` and `disparity` output of `stereo_image_proc`, but can't figure out how to either get the `stereo_image_proc` stack nodelets to attach to my nodelet manager or attach to theirs. Attempting to load nodelets using `stereo_image_proc` fails. And the configuration done inside of `stereo_image_proc` is complex and done programmatically as work around to a topic remapping problem, and so I was unable to rebuild `stereo_image_proc`'s elements: * `image_proc/rect` * `stereo_image/disparity` * `stereo_image_proc/point_cloud2` ... into the same functionality using simply a launch file which had a nodelet manager I could attach to.