Great list, thank you. The only thing to note is that whenever I imported a large list like this in the past, I always stopped checking my RSS reader after a while because the content wasn't interesting. I think finding RSS/adding it to a reader should happen organically over time.
This may be because most feed readers don't have a proper way to triage items. Adding a feed doesn't mean you want to read everything from said feed. Usually only a subset of articles are interesting.
I built a feed reader with that concept in mind, having a separate triage stage where you only decide if it's worth reading or not. This will make it easier to handle large feed lists and find the best articles from them.