Hi Paul,
Not completely sure if this would make the process more efficient, but it may be worth looking into. It worked with a very simple test survey I created. You could probably script it as well.
- Publish the survey
- Download service as FGDB
- Open FGDB Feature Class in ArcGIS Pro
- Add to Map, symbolize features with pre-defined image symbols that have been created with this workflow: How To: Import an image as a style in ArcGIS Pro
- Overwrite the service
- Create the stakeholder view
If you had a template Feature Class with an exact schema match to the Survey123 Hosted Feature Service, you could also probably just use that instead of doing steps 2-4 (haven't tested this component).
Hope this helps,
-Peter