There is a multilanguage, debloated ROM available for our phone that is a much better starting point than flashing the Chinese ROM and debloating it manually. It is based on 5.6.014S release. It comes with Google Apps, SuperSU, Adblock, System app remover and a few other features preinstalled. It also offers OTA updates (one just arrived today). I have been testing it for a past few days and can wholeheartedly recommend it!
Just flash the ZIP through TWRP:
Note that installing Xposed framework from official thread will prevent GUI to start.
Here's a compatible version (79) that someone made. Didn't test much so YMMV, but GravityBox seems to work fine:
Direct link: https://mega.nz/#!HIRCDKbR!JW8EyhH_J...Nq70fqk0qRHPH4