TL;DR
Create the possibility of sharing bluepints through different factorio installsWhat ?
My suggest is pretty simple, on the blueprint tab add the posibility to export to the PC a blueprint/blueprint book, and the game will generate the blueprints .txt and save them on Appdata\local\ in a directory called "factorio prints"The idea is that all those blueprints are always saved on the PC, even if you uninstall factorio(factorio uninstaller can also ask if you want to save them or not)