As mentioned on the Firmwares page its possible to "bypass" some issues.
G firmwares on Chinese devices
Its possible to flash a G firmware on a Chinese device. However, instead of posting the entire guide here I recommend everyone who is interested to read this forum post.
Google Play Services
Just visit the Chinese AppCenter and search for "GSM Installer". Alternatively you can find the installer here.
You need to root your device first. This can be done over "Settings>(Fingerprint) and security>Root permissions". Before this menu will be visible you need to be logged into a Flyme account first. After the root was successful, open up the Play Store and search for "morelocale2". Open the app, grant root permissions to it and then pick your desired language. There won't be a 100% translation, however the majority of strings will turn into your desired language.