The Faea F2S has an official cyanogenmod rom coming out from the manufacturer, the first ever phone to ship with cyanogenmod, it uses a mediatek mtk6589T 1.5ghz quad core cortex a7 processor, faea worked with cyanogenmod team to create an optimised kernel for it. You don't need a nexus 5 if you want a decent phone with cyanogenmod.
Lol, you clearly don't have a slightest clue what you're talking about. There already is a phone that ships with CyanogenMod installed - Oppo N1, the first official CM phone. There's is not manufacturer in the world that can make an official CyanogenMod - only CyanogenMod themselves can.
Custom firmwares are a big thing China (MIUI, LeWa, etc) and suddenly ability to have AOSP based firmware (CM, AOKP, AOSPA, Omni, etc) has become a competing factor for some Chinese manufacturers. Just because there's been some (pathetic) attempts from FAEA or Oppo (R819 - Omni) doesn't mean that anyone was even close to succeeding. Sharing sources only to select partners under NDA is just grotesque and goes against everything what open source is all about.
One thing I can guarantee is that there will never be official CyanogenMod for MediaTek devices! CM is moving towards Nexus + recent Qualcomm hardware direction what comes to officially supported platforms. Even once so great OMAP's are becoming a pain to maintain and there's 'major' platforms like the recent octa-Exynos yet to gain support.