"Unstable remove algorithms" (2015). I know this was in front of SG14 many years ago, but I don't know what happened to it; it predates the modern GitHub-issue workflow for tracking papers (https://wg21.link/p0041/github is a 404). Personally, I think it would be plausible to revive — I doubt it failed for any particular technical reason.

You might like to compare/contrast your https://github.com/TedLyngmo/liblyncpp/blob/main/include/lyn/algorithm.hpp

with https://github.com/Quuxplusone/SG14/blob/master/include/sg14/algorithm_ext.h#L68-L130

–Arthur