After playing around a bit more with Blink, I decided to tackle position projection and specifically per-pixel motionblur. The results are pretty good if not a little quirky in it's current state.
The Gizmo can be downloaded here
The example scene cam be downloaded here
Note: Not mentioned in the video is the altCam input. This has the specific purpose of allowing a projection from the non-rendercam, which needs motionblur from the rendercam's perspective. An example of this is in the demo scene. Fancy learning BlinkScript yourself? You can get your hands on my guide here!