Why would these modules / Blueprints be a separate thing?
About a month a go I toyed a bit with “hierarchical projects”
A bit like “hierarchical schematics”, but then on the project level.
If was just an experiment to see if I would encounter mayor problems, but it just all seemed to work as I expected.
https://forum.kicad.info/t/multi-pcb-project-idea/17657
Including a whole project as a sub project in a bigger project is a very flexible way of doing things with minimal changes on the development side.