Best advice for your situation:
Assign the Windows Update service to an account (which doesn't have to exist in your Windows install [like ".\FFFFFFFFF"] ) and it will never succeed with updates again. You can remove the account and let it run as System if you want to restore Windows Updates functionality.
In Win10 Pro, you can postpone an update for max 35 days (windows update - advanced options - pause updates), but never indefinitely. If a pending update will break your machine (and you know because you already had to uninstall it), there's nothing you can do; it will install in five weeks no matter what. It's a timebomb.
Adding insult to injury is that these are primarily "feature" updates, and the features are for Microsoft's benefit. The April 2018 update enabled "Timeline" in the Task View (Win + Tab). All session activity is now shared with Microsoft by default. It must be disabled in Settings - Security & Privacy - Activity Sharing... so I disable all the new less-privacy things I don't want, and there are a lot of them... a week later, they are all switched on again, without notification or consent, after a subsequent Tuesday update.
And this is the reboot I can't postpone, on the OS I purchased. It's part Heller, part Kafka.