Yeah, same thing, doesn’t work.
Looking at the pcbnew API and searching within the different xy_PLOTTER’s (PDF, POST, SVG, GERBER) only gerber seems to have this feature.
It’s missing in PDF_PLOTTER and in SVG_PLOTTER doesn’t work (as I expect it).
Anyhow… the workaround from above with the init file and restarting KiCAD might work on-the-fly when I look at this pcbnew.COLORS_DESIGN_SETTINGS class here:
I would then adapt the plot script to read out the current layer colors and swap them for the ones I desire, print and swap them back - no need to restart KiCAD and mocking around with init files, or?
Well, I’ll play with it tonight if I have some time to spare…