I have tried the "reader" part of many RSS apps, and to me it always sucks. If the original website is unreadable, I just don't subscribe to it. It if is nicely done, then the RSS reader usually makes it worse.
https://reinventedsoftware.com/feeder/
Literally, the only app I miss after leaving the Apple ecosystem.
The question I always have is how to keep a permanent archive of entries for long-running publication histories. You don't want the feed to grow without bounds, so paging (by time period or sliding windows of X entries) seems useful. Atom feeds have RFC 5005 links. I don't recall such for RSS 2.0, but it wouldn't be that hard to extend, I guess.
The nice part was that the bit that was mine was just a single static file.
The awkward part was the URLs looked crappy.
Have a website.