About starting new game to change already started locations was just my thought, I`m not sure if it like that.
For location files in my games it`s like this :
C:\Prog...\Atari\The Legend\sessions\base\locations\ - and there are all files about in game map locations
C:\Prog...\Atari\Armored princess\sessions\addon\locations ...
For WotN should be in similar folder. And i thought there was some way to alter your savegame files, i`we read about it before on forum. Like adding certain items/units in shops/castles and so on. Maybe you can do it that way ?
http://forum.1cpublishing.eu/showthread.php?t=11780 post #4
Or search google for `Kings Bounty save game editor` and try to figure some of results out. Also check KB_scanner readme.txt file (i know, who would thought it can contain useful info

) , part about editing already existing save file.
Good luck making this operational, and getting your executioners