Thanks for the new script - nice!! Also, I'm glad you liked my split-tone PP Challenge image.
I've noticed another behaviour that doesn't seem quite right.
If I choose a matte of colour Cream, and a texture of Burlap, I don't get a Cream Burlap Matte, I get a shade of light grey burlap matte. This is because the grey burlap "texture mat" layer, above the cream "colour mat" layer, in Darken Only blend mode, imposes its own colour too much, if that makes sense?
I tried it with a white/burlap, auto/burlap, black/burlap - the white and auto also came out as a shade of grey, and the black surprisingly had a different effect, it came out very black with no texture. The Auto in the landscape I used came up with a colour mat layer of lovely mint green, but the final textured mat was a shade of light grey. All the light greys are different, indicating that some colour is getting through, but not enough (apart from the Black situation). If I alter the opacity of the texture mat layer, I can get the colour to come through, but lose the burlap texture too much.