If you have an email workflow that you like then something like rss2email might be an option. You simply feed your incoming rss into your email. You’ll want to auto-tag (or otherwise organize) these emails to keep them separate from regular emails. Then you use your usual email tools to organize them further.
I’ve been using such a setup for the past 15 years.
What I see is an inexperienced developer who instead of systematically debugging the issue keeps trying random stuff hoping that it will somehow work.