I realize this is an old thread but I solved this problem using the Developer Mode described here:
http://translate.googleusercontent.c...mAetnA2YLYktQ\

If you cannot view the site:

Right click on your KB shortcut and click properties.
Add "-dev" without the quotes to the end to enable Developer Codes.
Backup your save game in case you make a mistake.
Once you load up your game pressing Ctrl+[Number row 1-0] will spawn units of a specific type.
WARNING: This will replace any units you currently have even those in reserve so you must save your current troops (if you want to) in a castle garrison.
Spawn units till you get what you need and you can use an empty garrison slot to save what you are looking for. This may be difficult if you don't have enough castles unlocked/visited.

Well that is pretty funky, thanks for sharing! :)

Daniel.