I'm building up a Wikipedia <-> LCSH crosswalk for the Forward to Libraries service that I maintain. Some of the crosswalk is automatically generated based on identical or similar headings; some of it is manually maintained in a "wikimap" file. That manual file currently has just over 6,000 entries, and is available as CC0 data from Github:
https://github.com/JohnMarkOckerbloom/ftl/blob/master/data/wikimap
Between the manual file, the automatic matchups, and the name correspondences provided by VIAF, my forwarding service can map between over 300,000 names and topical subjects in Wikipedia, LCSH, and LC name authorities.
Folks are welcome to reuse my crosswalk file or contribute further updated to it. Or, if there's somewhere useful to embed this sort of information in Wikidata, I'm open to using that for getting or maintaining crosswalk data.
John