I don't think my "stored Win 10 key" in the cloud will suffice. Any thoughts?
O Windows 1607+ permite vincular seu direito digital ao Windows 10 à sua conta da Microsoft.
In Windows 10 (Version 1607 or later), you can link your Microsoft account to the Windows 10 digital license on your device. This can help you reactivate Windows using the Activation troubleshooter if you make a significant hardware change later, such as replacing the motherboard.
Vale a pena ressaltar que, se você não vinculou seu direito digital à sua conta da Microsoft, essas instruções não serão possíveis.
If you didn't add your Microsoft account and link it to the digital license on your device, you won't be able to use the Activation troubleshooter to reactivate Windows after a hardware change.