WHat your talking about is something like this:
Motion Control Rigs, Cameras, Heads, Platforms, Pan Tilt Heads, Cranes and home of Milo
So the way you are setup now, is you have softimage spitting out your info, and you will want to pursure Mach3 at machsupport.com to look into customizing the mach interface/controller to read and act accordingly to the information you send it...
Otherwise, what you are looking at is the "CAM package" that will create the code that cnc controllers read.. For what you are describing, you would be looking at full 5th axis CAM software (NOT JUST 3+2), and then need to see if that package can read your CAD data from softimage to generate the code you need, which would be different than the code you presented.. or you would need to recreate the CAD data to generate the code to match your motion path and actions. (You have the cart before the horse for this.. You would want the CAM package to generate your code, not softimage)
Maybe asking softimage if they have a contoller suggestion that works with that output created by the software..