Actually, I'm not really sure what you're trying to do anymore

As of 1.19, you can now switch between three different outline methods:

• Vertex normals
• Vertex colors
• From origin

The first one is the default behavior we've had before.
The second one will read the vertex colors as directions. I've added a script you can add to your objects, to make their meshes write outline-style normals into the vertex colors. That way, you sacrifice the ability to use vertex colors, but gain the ability to have hard edges together with a continuous outline!
The third one is as the "scaled" method mentioned above - it will move the verts away from the origin.

Hope it helps :)

Ah, I see! 1.19 should roll out tomorrow :)

I can't seem to reproduce this, scene color seems to work fine on my end

This has now been fixed in 1.19

This has now been fixed in 1.19

"Illegal characters in path." sounds as if the shader is in a folder with special characters

Thanks :)
I actually never had the time to look into it - about to hit a deadline tonight on another project, so I appreciate the help!
I'll try to make time tonight again

I'll look into this tonight

I'm guessing you may be forcing DX11 somewhere? Have an extra look at your quality settings and player settings. Also, you have a warning in the console.