Wow! Thanks a million DaltonST!
This is indeed, exactly what I had in mind. Did you add this icon-customizer to JS+ in response to my post? Or had you already planned it? Either way, thanks. As it turns out, I had recently installed the plugin, I just hadn't had a chance to explore it yet.
Here it is in action.
https://i.imgur.com/4XpQ53g.png
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I want to read your documentation, then I'll reply again.