Mastodon’s allowlist mode also implies AUTHORIZED_FETCH which in turn implies that all pages are only visible to logged-in users, so the above Mastodon link does not contain anything useful.
Akkoma wasn’t working — attempts to start it in Docker led to confusing Postgres errors I lacked the patience to debug further.
Kitsune has not yet reached the point where it can be deployed even in contexts like this.
I could find no other ActivityPub software (aside from forks or upstreams of these) which both was actively maintained and supported allowlist federation.
The profile icon for each user means “jan taso” — “only person” in toki pona.
This project was inspired by my peripheral participation in the Website League.