Need help adding a recolored texture to a skin model

[TacticalTilting]

Hello! So I am trying to change the texture of the fire panda with a custom texture to make him a "water" panda. I managed to extract the texture, recolor it and convert it as a .blp file. Now I am having serious trouble with adding it to the default mdl/mdx file because I don't have a program that allows me to do that and I have tried a few of those programs, the only one that really helped me is the Retera Model Studio but it seems that it can't change the default texture with the custom one for some reason, also the world editor dosen't recognize mdl/mdx saved by Retera(I have wc3 reforged latest version). Is it possible to do this? If yes, is it gonna be hard work to do? Or am I doing this the wrong way? I have attached the .blp file if someone can help me or do it for me I would very much appreciate it.

 

[Chaosium]

Here you go, remove war3imported\ in the filepath when you import the texture and that's it

 

[TacticalTilting]

Here you go, remove war3imported\ in the filepath when you import the texture and that's it

Thanks a lot for the help!