Do you think managing CL packages in a way similar to 1968's Grail (https://www.youtube.com/watch?v=2Cq8S3jzJiQ) could work? I'm thinking of a visual overview of packages were a user can connect packages together (maybe by drawing lines or by holding a key down and clicking on packages to link them), and can afterwards click on the vertices connecting the nodes to configure which symbols get imported.

It might be a bit UML-ish, but that's probably because I spent a bit too much time playing around with Umbrello.