Just an idea, there are tons of rss clients for other fediverse services (e.g. Mastodon). Maybe it would be possible to fork one of those and replace the posting code with lemmy. Or, on a more meta note, write a bot that reposts and account from another service, and just use one of the many bot instances already existing.

I started making remmy but had to stop because lemmy refactoring, but mostly cus of exams :/
Will resume working on it once I’m freer, but patches are always welcome ;)