This is my first time modding an apk and was it frustrating. Realized that I had to use the stock framework-res and twframework-res, then came the signing an apk. I also had problems using apktool at first. I ended up having to download apktool2, manually configure java through the Linux terminal, and etc. I can now do this in like 2 minutes now, though!
I did take the apk from the Hypderdrive RS17, which is based on KK. I'm not sure if it'll work with all KK or only Hyperdrive. Let me know, although I don't know enough to fix it.
Change the permissions to 0644 and move under /system/app or /system/priv-app/ (depends on the Rom)