

What I am hoping is that I can generate an access key auth in Authelia. Synfonium supports accessKey as an alternative to basic auth for subsonic.
Maybe you could try that with caddy-security?
Synfonium is closed source, but you can use the free trial to test, and buy it outside of Google Play (which is the only reason I haven’t dropped it earlier on my quest to de-Google)
Is putting it behind an Oauth2 proxy and running the server in a rootless container enough?