I too would love to use the watch face of my choosing over the HTC default clock on my phones home screen. It seems so simple and I can almost guarantee others would use a clock widget with the customization features of WM.
Widget version would open up Watchmaker (and paid/free faces) to the millions Android based smartwatches. Could probable ask $5 for it and still get a lot of takers.
I simply can't find any good home screen widgets for my essentials, as I have fully programmed my watch, I could replace half of my screen with the watch, instead of making a new one from scratch. Should be easy to implement.
PLEASE, make this a widget for placing working clocks on my iPhone screen!! I would pay serious money to have access to all these incredible watch faces in my iPhone XR.