Glad to see it’s coming to iOS.
If you’re already looking at ways to expand, how about a picker for feeds where there could be a choice. Bluesky for example defaults to the butterfly logo, but any of the social sites you could likely pull in their profile picture. If you then go so far as to implement a picker interface, you could show the feed default icon and allow it to be reverted from it instead of a button to revert.
It would also be nice if you’d consider supporting SVGs, and if you’d list in the modal the recommended dimensions for the icon.