I am happy to let you know about the initial release of the primary sources tool. More info is available here:
https://www.wikidata.org/wiki/Wikidata:Primary_sources_tool
The release is meant to facilitate your feedback. There are probably plenty of things that should be fixed before the tool gets widely used. Please report the issues:
https://github.com/google/primarysources/issues
Even better are pull requests!
A huge shoutout to Sebastian Schaffert (backend) and Thomas Steiner (frontend) who worked on the tool in their 20% time.