Wallace's suggestion below, applied to subject headings, would not really be workable, as different libraries do not use the same set of subject headings. (For instance the National Library of Canada defines "Canadian Subject Headings", which are similar to LCSH but more focused on Canadian topics.

Aha! A good reason to perhaps use NLC codes for works of CanCon (Canadian Content for those not in on the reference.) The proofreading is distributed... the reorganization of the file system was done on a piecework basis... why not the cataloguing? Bit by bit, there aren't THAT many titles in the overall scheme of things. We'd need rules and volunteers. In the little dictatorship that is my own library, I catalogued nearly a thousand books and several hundred discs in a fairly brief time, and have added to it on a piecemeal go-forward basis ever since.