Miqviq,
Several of us have worked through the problem in a few ways.
Option A:
1. On a VM/test machine, activate it and grab the generated license from /Library/Preferences.
2. Use a ChoiceChangesXML key in the pkginfo to remove com.microsoft.pkg.licensing_volume from being installed, preventing the loginwindow issue.
3. Create a package and deploy the licensing file.
3. Deploy the updated Microsoft packages.
4. Use LaunchAgent/postinstall to trust the Microsoft AU application.
Option B:
1. On a VM/test machine, activate it and grab the generated license from /Library/Preferences.
2. Deploy the updated Microsoft packages only.
3. Create a package and deploy the licensing file.
Option C:
1. On a VM/test machine, activate it and grab the generated license from /Library/Preferences.
2. Deploy the current Office 365 package (which contains all current updates and all additional packages, minus com.microsoft.pkg.licensing_volume).
3. Create a package and deploy the licensing file.
4. Use LaunchAgent/postinstall to trust the Microsoft AU application.
Option D:
Complain to Microsoft and let them know they should fix this.
No one knows if anything beyond option D is a "support installation". For our testing users, I'm opting for Option A, but I may change my CCXML pkginfo or move to Option B/C as they are faster deployments.