Editing the grunt

[Kreekakon]

I don't have time to confirm this by testing it right now, but...

...you could try opening up the Grunt's texture, checking "Alpha", and applying a image that completely obscures the texture. I quickly did it with a partially black image, and most of the texture in the material preview just flat-out becomes invisible.

EDIT:

The quick test I did. I used the Grunt's hair as the alpha image.

Spoiler below!