What you can do is hide the items with CSS, however than the items are hidden for everyone. Also, the functionality is still there, so if a user knows the correct URL than he can still visit the pages.
What we did here is combine this by hiding all these items from all users and creating a specific page with restrictions containing URLs to access the items that super users need.
BTW you can disable the Atlassian Marketplace menu item, it is a setting somewhere in the Admin section for managing addons.
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