Allowing selective move of some edits from one article's edit history to another article's edit history, would avoid much waste of administrator time and internet time and Wikipedia server time deleting the whole of a long edit history and later undeleting some of the edits, when needing to move some edits and leave the rest where they were.
As an admin I have often been asked to extract particular edits from one article's edit history and history-merge them into another article's edit history.
This method of splitting an edit history would not involve deleting, and thus would not be affected or endangered by pre-existing deleted edits at the same article name as the visible non-deleted edit history.
The history display of non-deleted edits already has a column of small square clickables, one per edit; this column could also be used to select edits to move.
That column of clickables should have controls for "unmark all" and "invert the selection". (Selective undeleting already has an "invert the selection" feature.)