Compatible with iOS 6.0 +
This tweak allows you to override system's emoji font without swapping them. Access Settings app > EmojFontManager to choose your font. Fonts (folder with extension .font AND having AppleColorEmoji@2x.ttf/.ttc font inside) that can be used by this tweak should be placed in /Library/Themes/EmojiFontManager. It is highly recommended to respring after you change the font.