Check out Bazzite. It even has a GNOME variant.

Unfortunately, Bridgy Fed is currently opt-in. For a Bluesky user to interact with a Mastodon user, both have to follow the Bridgy Fed account. There is ongoing discussion about Mastodon instance opt-in, and making Bluesky opt-out.

I highly encourage you to participate in this conversation as a Mastodon user.