RSS is awesome. My favorite fun fact is that podcasts are RSS-based, which is why you can listen to any of them from any podcast app.

You could try using it as a PWA. Just add the website to your home screen via Safari. You could also try using Brave to access mbasic.facebook.com. All browsers on iOS are basically just Safari (unless you live in the EU), but at least it comes with a tracker blocker built in.

I believe that NitroKeys are open-source. The New Oil did a video covering them.