This tweak will allow you to display both of Zawgyi and Unicode in one place. You will need to enable the specified apps in Setting. Its only support the Facebook.app now and if you want more apps and features or want to report bugs, just give me feedback from the Setting -> Parallel -> Feedback. Thanks. The tweak will be opensourced soon on github.
- Enable the tweak in Setting > Parallel > Enable
- Install both of Zawgyi and Myanmar3-Regular fonts profiles in setting.
- Enable the apps like you wished in Enabled Applications.
- Open the App and Enjoy !
Configure options from Settings.