Lol ok this is what I did nothing else try it if you really want it I did it nothing happened.
Install that Chinese recovery.
Now download black kit Kat ui from the LG g3 international forum under apps and themes (pick the one that downloads the contacts dialer and setting)
Move it to your internal memory
Open the Chinese recovery app
Click install recovery
Click reboot recovery
Navigate to where you have the file is located
Install the file
Reboot to system
On the first question the recovery asks you when you attempt to reboot system
Say NO
Second question fix root
Say yes
Now setting was not themed for me on my Verizon variant
So I downloaded holo themer
Scroll to settings and use holo dark. See if that works