Ok, done! Tested with EMotionFX at work and it worked great! It will probably work with both Unity, UDK, or any other animation system, but I’d love to hear from anyone that tries it out.
You can download the .py over at github, or all ziped files here. The readme files explains it all. You just need a characterized character, an animation ploted on take01, a pose ploted on take02 to be subtracted and an empty take03.
If you find any bugs or have any question, ideas or feature requests just send them my way.
Edit: added an example file using the Gremlin sample scene. Just open it and run the script. You can get a good idea of how it works by studying the content on the takes, it’s quite simple and straight forward.