Sure. I don't mind sharing it, but don't know if it will help anyone

. It's a one-shot script. Everything hard-coded, no error chekcing/handling. no nothing

. You have to modify it, or it probably won't work at all. On top of that I'm using linux so to use it on windows, you have to modify it even more.
About the covers: K4PC, and the Kindle itself, are showing the embedded cover. The only problem is with the android reader. I don't have any iDevices, so I have no idea about that.