Only way I know is to flash a custom ROM, like Termin. It has Xperia Z lockscreen and AOSP lockscreen. But you have to rename some stuff, depending on which one you want. Read the thread a little bit, so you get what I'm talking about.
With xda:devcon ’14 just around the corner, and the venue close to selling out, there is a lot … more
18 Sep 2014
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?