Sorry for the late reply.
I had already edited my ppd file a while ago, and I'm not sure I made a backup of the original. I'm still clueless about how these files are generated and installed exactly. So I cannot promise I can try the sed script at this point. But if someone sends me a ppd file to try out I can certainly test it on my system.
I can attach the file as I'm using it now later today, if that's helpful.
Marcin