Sounds like the author wants something like Mercurial's https://mercurial.selenic.com/wiki/ChangesetEvolution https://mercurial.selenic.com/wiki/ChangesetEvolut

Sounds like the author wants something like Mercurial's https://mercurial.selenic.com/wiki/ChangesetEvolution https://mercurial.selenic.com/wiki/ChangesetEvolution. It will allow you to rebase and do all kinds of heinous things to your history, but still maintain the original commits that things came from.