I sometimes copy paste things into the browser URL bar to strip formatting
Me too. Copy-pasting with formatting is almost always what I don't want. It's even more of a disaster on a Mac, because the handling is MS Office is much worse than on Windows, and Outlook has about three total settings on its preference screen, so there's no way (I can tell) to change the default behavior.
If you're willing to try a menubar app: https://apps.apple.com/app/id1611378436