Hi - I’m confused now. In your earlier post you wrote that, as an example, you would create a template with 10 blocks. Those blocks must contain some geometry, no?
Yes, that’s the tricky part.
If you, instead of using the default Active as Layer Style, use Reference, removing and renaming layers in the linked template will update correctly in new files. But, in this case, layers cannot be empty in the linked template.
If I’m not mistaken, @Helvetosaur is writing a script that can read layer names from external files.
If using linked files doesn’t work for you, you could probably look at that one and see if you can modify it to your needs. → See Importing layers via Rhino.FileIO
-wim