Wow, I'm glad I checked here first before running this, thanks for taking one for the team guys (and sorry for the grief it caused you) !
I hit the link that says "more..." next to the description of the complete update, then it revealed the 3 separate updates for iTunes, Safari, and the 2018-001 update itself.
Then I could control-click in the text next to the 2018-001 update description, and select "hide update".
I don't have anything set to auto update in the app store prefs, so maybe that saves me. Fingers crossed anyway.
I ended up installing the iTunes and safari updates one by one separately, without hitting the "update all" button.
Both Safari and iTunes seem to be working fine, as is the rest of the system after shutting down and rebooting to test (so far anyway, crossed fingers).
Just figured I'd let you guys know that the new versions of Safari, and iTunes don't seem to be dependent on anything included in the security update.
- Jay