Mostly yes, but with one important detail. Rocksky has a minimal ListenBrainz-compatible API, so duplicating the ListenBrainz integration and pointing it to the Rocksky endpoint should work for basic auth + submit/scrobble. The current limitation is that Rocksky doesn't implement the full ListenBrainz API yet, so anything beyond auth + submitting listens may not work the same way. I'm trying to keep this path as simple as possible because compatibility with existing scrobblers is important for adoption.