Default [Q] Ramdisk hijack for locked bootloader?

I've changed to the Xperia Z from an Xperia SP, and there was a few talented developers who managed to hijack ramdisk, and boot custom roms, even CM11, with a locked bootloader device.

Is it possible to do on our devices?

For reference:
Ramdisk hijack for SP
Fully working ramdisk hijack
Working custom ROM for locked bootloaders