SfB2016 Mac Client, Keychain, and Clean Uninstall

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I've recently been building an uninstall script for Skype for Business 2016 for Mac, using the steps at https://support.microsoft.com/en-us/help/3202833/how-to-do-a-clean-uninstallation-of-skype-for-busin... as my process template. In the last step, instructions for deleting SFB specific keychain entries is listed.

 

From my test Mac, it looks like these entries are unique on each users keychain. In cases where the machine might have multiple user keychains (like multiple AD integrated logins), I don't think I'll have access to the SfB keychain entries until a user logs into the machine.

 

Can I trust the Skype for Business client to handle those old keychain entries properly in the case of uninstall/reinstall during launch? Will it clean up/overwrite what it finds for each user's keychain? Or is it better practice to build and deploy a keychain cleanup script that runs for each user during first login after the uninstall/reinstall has completed?