two options replace the master material contents with something you like make an editor utility - you can do that with blueprints or for bonus points - do it in python
Thanks for the reply, @poopipe! The idea is to avoid making things manually, automating this process as much as possible. So replacing contents by hand would be my last option. Blueprints and scripts seem to be the solution. But unfortunately, I'm currently only skilled in hard surface modeling, and my Python/Blueprints…