Both solutions are teaching us something which can be applied to other customization needs: workarounds about presets/default assets or making more from guided edits by following in Expert mode. Examining the layer palette was first a mystery to me because I was not used to layer groups.
Here is a try of the tool - I did NO adjustment. I just selected one of the sky choices. The original sky was a flat grey sky with no clouds, nothing! Impressive for sure. i.ibb.co/gSyZc5V/DSC-5621.jpg