I personally want to add a music feed from a pubkey (or list) to groups in Coracle. I would pull from wavlake, but there's no way I know of to filter by pubkey because they publish on behalf of their artists. Zapstr does pretty close to what I want, so I drafted the NIP using their event kind with compatible tags.
Discussion
We have the same end goal. In the meantime I think that creator tag in your proposal could be a good enough bridge to enable what you'd like to do (which is follow and filter by artists, I think) until we get there