As a work around, go to.... Settings apps... Select the app /game then select storage, here you can choose the data storage location, select change you'll have the option of internal or external. Most games will allow this out of the box. If the option is not available for the specific app, go to developer options, there's a setting to force selectable storage for all apps. Let us know how you go.
Another option you could try is an xposed module, XinternalSD. It has a setting to designate the path to the internal sd, just enter a path to your external sd. /storage/("external sd name ") /
I've not tested that on this rom,
Nice try with the workaround but the most apps and games do not move the data to SD card with this option. The just move a minimum of data but for example "Minecraft Story Mode" it still stays with 4,5 GB on the internal storage.