I have a process diagram that uses about 10 colors as shape backgrounds, and some of those colors are hard to read (like #E10098 with white text or #009900 with black text).  There are a few hundred shapes on the diagram and the color usage isnt consecutive where I could selectable a block of shapes to edit at once.

I want to make it more accessible/easier to read, is there a way to change a background color across the whole diagram?

For example for every shape with a background color of #E10098, change the background color to #008573.   It would be really excellent if this could also be used to set a gradient also..