They are based on dottat's mods here. (many thanks!!!)
vzwm8_6.0_tetherpassword.zip can be flashed in whatever fashion you feel most comfortable. I tested it with TWRP recovery.
If you're editing your own default.xml and find that you've changed something that borks your android UI [it will tell you that you have, and deny you access to the OS], you can flash the vzwm8_6.0_original.zip to replace it with an original from my device.
If your UI is locked out, hold the power button until it notifies you (sound/vib). After you close the next warning box, you should have a box that lets you power down. From there, you can boot to fastboot/recovery as usual and fix it.