Option to use Icons instead of color blocks for keywords

Would love to be able to use the list of icons on keywords instead of just the color blocks. This would differentiate the keywords more when viewed in the outline when “showing keywords as color chips” is selected. Right now, with my old eyes, it’s sometimes very hard to tell the colors apart, but with an icon the difference would be clear. (and yes, I realize I can use the words and not show the color block, but with so many keywords, using the words gets messy). Thanks for the consideration.