KSE v2.2.0 (
http://www.pcgamemods.com/9170/) has been released at PCGameMods. This version provides support (albeit limited) for Xbox saves by regenerating the critical .sig files.
More information is contained in readme included with the download.
You must be able to move files to and from your PC to perform the editing.
Cross-reference: Official KSE thread (
http://www.lucasforums.com/showthread.php?s=&threadid=123671)