Edit Grim Dawn Shaders or make new one .SSH

Is there any tool to edit Grim Dawn .SSH shaders or make new one compatible with Grim Dawn ?

I have an issue with one of my items which is too bright, and I know changing the shader with the grasse shader solves the matter but it creates another issue (double item !)
So I would like to edit the grass shader to make it work with items (I have no longer Autodesk 2012).