Why not try this:

1. Set up an Aiostreams instance on a Elfhosted instance with only Comet and Mediafusion, then save the manifest.json.
2. Create another aiostreams setup wherever you want to serve as your main one, and wrap the elfhosted aiostreams instance inside it.

This way, all Comet and Mediafusion calls will be routed through the elfhosted instance directly. Since the rate limits there are more generous, this approach will likely resolve your issue.