I can look into rewriting the GUI of this tool. What I used here was a GUI programmed in something else that just runs an invisible command like that calls the tool, I'm sure since I could make a new one that's platform independant. Say, do any of my more recent tools (e.g. Palette Interpolator) work on your machine? That tool contains a JAR file you could manually run along with the Windows-only executable but I'm not sure whether Swing works on other OS'. It probably should.
Sorry for the late response.
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I'm sorry for a late response, but, I have 2 results of the Palette Interpolator on Linux.
1. Windows only executable - It crashes with Wine.
2. Running the Jar file - I had to allow it to run as an executable first, but otherwise, loading in a palette, saving it, and interpolating seems to work properly, used OpenJDK 11 Java Runtime for the testing.