expectation failed

Yap, for example RSSHub-Radar works fine for me. Would you share with us any good suggestions, please?

With PC GUI: APKToolGUI

With Android APK: APKExtractor

Terminal: combinating jar files like APKEditor.jar, apktool.jar, apksigner.jar

Bonus points if Anyone can link me to the page I used a few years back that had all sorts of privacy enhancing and telemetry disabling option on the left side and would create a reg file for applying those changes on the right

Sounds like https://privacy.sexy/ might be the answer?