In option two, you can download the uninstall cab file, use 7-zip unzip it, you will find some vbs and powershell scripts in the unziped folder.

Here is what we think may help us: do you know how to prevent Office 365 ProPlus installation from starting until the dependency application uninstalls Office 2013 or at least how to start Office 365 ProPlus installation task only after the Office 2013 Removal and also you'll need to learn PowerShell. I can imagine the slogan: the SCCM vNext will be harder to manage then the current one. Microsoft claims each release brings more easiness of the administration. Unfortunately, I am a mere SCCM admin and not a programmer. Jörgen, I was unable to grasp the PowerShell script and we won't be able to support it because of its extreme complexity.

However, in both cases the Office 2013 uninstall finishes after Office 365 is started which we want to avoid. Krishna, you recommendation may be good for the small deployments, but, unfortunately, it does not work in our environment. Jörgen and Krishna, thank you very much for your recommendations!!!