I just found my old previous dark soul start save and it still works fine with this new edition, so I'd thought I'd share it with the current save editor made by jappi88, so you can customize what you want. Download: http://www.mediafire.com/?ja62c1q5rd5zr6e Hope this helps.
It doesn't work. There are some unknown items that are mandatory to complete the game (for example, some keys). Don't waste your time. Play again the game and enjoy the DLC.