The UI is different, but maybe the method I used will be helpful! I’d love to try out the program you made, too. Although there is a way to import hex values using AutoHotkey.
just give me OKLCH dude i'm so over it. we've been using this same HSV/HSL wheel cope for 40 fucking years. these pathetic hue/sat sliders don't preserve perceptual luminosity and i'm sick of pretending like it isn't terrible.