I have previously considered it, but making a good “package manager” is a lot of work, hence why no one has effectively accomplished this yet.
In my work I often use symbolic links (mklink on Windows, ln on Mac/Linux) to avoid manually copying resources when updating them. If you need to do this really often, you could make a tiny plugin to automate the process of creating a script, removing its GML file, and creating a symbolic link pointing at the GML file in a different directory.