I am currently working on alpha PieFed support for Photon.

The PieFed API is missing a lot of features from native PieFed, so not all functionality you'd expect will work (notably, the inbox.) I can't do anything about this until those features are added to the API.

The way I'm writing this will also allow Mastodon support in the future.

Status

I've already implemented basically the entire AVAILABLE PieFed API. You can try a beta here.

You can view my progress at via the pull request on GitHub.