Actualy, those camera rigs were not used to grab 3d volumetric data from Keanu.

A CyberScan(tm) rig was used for that.

One thing I would suggest is to find the actual curve of your current camera path, (best done via mel), then duplicate your camera and that curve, and create a new scene file with the new camera and curve data so that you can simply adjust the framerate of your shot from, say, 30 fps to 120fps, render it out, and co,p that into your original shot at the right place

Good luck!