How to block all Software Update Notifications in macOS?

The *Software Updates* in *System Preferences* are all disabled. In spite of this macOS continues to show Notification Banners in Catalina (and Big Sur) which some users accidentally click to initiate an update. **I want to stop macOS from showing all the Software Update notification banners** to prevent accidental updates. Yet I still want to be able to manually initiate software updates when desired. Previously the following has been suggested: 1) softwareupdate --ignore “macOS Big Sur”, but this is not available any more as a command option and would block only major upgrades not minor or security upgrades AFAIK. (Only available in High Sierra up to Catalina with *Apple Business Manager* enrollment, *Apple School Manager* enrollment or Enrollment in a *user-approved MDM*) 2) Moving com.apple.SoftwareUpdateNotificationManager.plist from /System/Library/LaunchAgents to /System/Library/LaunchAgentsIgnored, but in order to make these changes, one must boot from another disk, otherwise System is read only. Also the notification will reappear if *Software Updates* is selected in *System Preferences*. This is cumbersome as it means a lot of steps including additional reboots when updates are desired and manually initiated. I am currently testing another proposed solution which is to install the [Lulu application firewall](https://objective-see.com/products/lulu.html) and then to block /System/Library/CoreServices/Software Update.app/Contents/Resources/softwareupdated. Blocking and re-enabling softwareupdated for manual updates would be less cumbersome than disabling and re-enabling the system protected LaunchAgent, but I am not quite sure, if it will actually prevent the notifications from appearing. Who can confirm that this works in the long run? Are there any other options to accomplish this? *Related questions: [How to block updates to Mac OS X Catalina?](https://apple.stackexchange.com/questions/367995/how-to-block-updates-to-mac-os-x-catalina) / [Remove macOS Big Sur "Upgrade Now" button in System Preferences](https://apple.stackexchange.com/questions/406545/remove-macos-big-sur-upgrade-now-button-in-system-preferences) / [How can I permanently disable App Store notifications in Big Sur?](https://apple.stackexchange.com/questions/409093/how-can-i-permanently-disable-app-store-notifications-in-big-sur)*