I’ve done a first step in that direction, dealing specifically with elements that were deleted by the vandals at any stage, and restoring then to the latest version prior to any update by a vandal.
A Python program accepts a list of vandal account and produces a JOSM file. That format was chosen since it requires only minimal changes to the history XML of the elements in order to enable uploading it using JOSM.
It is also a first step in the sense that it will enable the correct revert of ways and relations which were reverted without some of their components, such as this building that is lacking its 16’th node.
