You need to download the "stock" lockscreen.
Take out the android.policy.jar file and push it to your phone.
Now taking into consideration that the png's are still located in the hdpi folder in framework this SHOULD work.
If not you will need to get the lockscreen icons out of the framework.res file hdpi folder and push those to your phone as well.
Always make a backup. But this is how i did it to my phone a while back when I wanted the stock lockscreen.
Hope this helps.
If you don't get it, when I get home I can make up a new theme for you and send it over.