Jim, thanks for the great write up of how to use shortcuts to add this complication 
I found this Apple support article, on how to enable taking a snapshot on the apple watch. This might help you on that one.
And one thing I had figured out a while ago is that the older Apple Watch faces do support adding the Smart 3D complication directly. Try on either the Simple or Utility faces as an example. Although with IOS 14/WatchOS 7, the icon doesn’t show up anymore - but if you press the watch where you put the complication it will bring up the Smart 3D app on the watch.
I’ve sent an email to resound asking if they can add their complication support to the newer faces, and letting them know about the problem with the icon. I’ll report back here what I hear from them.