Reading https://github.com/git-lfs/git-lfs/wiki/Tutorial#migrating-existing-repository-data-to-lfs, our options are either to rewrite git history in our repos, or create new repos. We need to do one or the other to avoid having the gigantic history in our repos.
Who would be in a good position to give us advice about how to proceed? The masters for our huge repos are,
On another topic, we need to make sure that scap will rehydrate the repos.