MaplesM now has some files which do not use crabindex, is it possible to assign colors to them with Pallete? Examples from APK here https://apkpure.com/maplestory-m-fantasy-mmorpg/com.nexon.maplem.global 

example.zip

Echoing the reply here too for any others (as it sounds like you were able to update the Python script I wrote in 2023-06-26).

• Extract alpha channel from the index image to a grayscale image (I used a little cximage demo app).
• Flip the palette file vertically.
• Replace the index image's grayscale palette with the colors from the palette PNG (using the image editor of your choice).