Reached out to the team of Openvibe a bluesky, mastodon and threads client for iOS. They recently added rss import via OPML. It displays an all in one timeline from all three systems and rss feeds. They would be the right group to support OPML sub feeds in/out and even rss source pub to other apps.

Love it Ray! Yes you could import via the Dropbox api in studio but now Dropbox can be natively accessed via the Files app. Also, have you tried the automatic captions?

Thank You!