Yes, I have the wParallax products.
I don't think Maxwell supports OSL shaders but creating a box with reversed normals and UVs matching the image template works.
OSL support is not consistent.....
Octane for Modo had a hard time with wParallax but Octane in Cinema4D handles the OSL just fine.
Redshift handles wParallax well too.
The wParallax figure pack is good too but so are many other 2D cutout libraries .