I wanna recommend this app, @skyscraperapp a Mastodon/Bluesky client for iOS.
It has really exelent VoiceOver support, including reordering how VO speaks posts, and the developer is very open to feedback on accessibility issues.
The only downside I guess is the requirement of a pro subscription to sign in to a Mastodon account, but I can kinda understand with this app starting out as a Bluesky client.