After playing around with ReverseSTMap I realised that there's a world of uses for this function beyond transformations. By combining this tool with methods created by Erwan Leroy and Compositing Academy an artistically more-friendly method of keying & despill can be had.
Follow along with the Nuke script used in this experiment here!
Follow along with the Tears of Steel plate here!
Erwan Leroy's "Make a custom advanced Keyer using STMap." can be found here!
Compositing Academy's "Gradient Re-Mapping and Quadratic Luma Keys" can be seen here!
Find the original demo of ReverseSTMap here!
Fancy learning Blinkscript yourself? Checkout my guide here!