Neat script.  However there a problem not with the script, but with Poser.  Currently you can appear to change the values on the inputs of a Compound Node but those values are not transmitted into the working of the Node itself.  In order to fully change the input values you need to make a small change to each input manually in order for Poser to know that an input has a new value.  The bad part is that you cannot change it to the same value.  So in this case click each color chip and select a color just below the top left column and it puts in a color very close to what was shown.  This is also a problem in Poser 12.

There is a ticket in and it is on a list of fixes.  Right now they are working on getting 13.1 ready for the end of the month.  

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13