The R116 is closely related to the Cool1 C103/C106, but there are known differences.
Most importantly, the LeRee audio configuration is different. Existing Android 9 development includes a separate LeRee mixer configuration and a microphone/audio fix using:
A developer who could assess the existing sources and build a proper /e/OS Pie ROM specifically for the R116, including the R116-specific hardware configuration.
Wi-Fi: The ROM includes wpa_supplicant.conf, but installs it to the wrong location: /system/etc/etc/wifi/. The Wi-Fi stack expects the file at /system/vendor/etc/wifi/wpa_supplicant.conf, where it is missing. Copying the existing configuration file to that expected path fixed Wi-Fi immediately.
BlissLauncher: the included foundation.e.blisslauncher 1.3.2 crashes on Pie because it tries to load android.graphics.BlendMode, which is unavailable on API 28. Replacing it with the F-Droid BlissLauncher 1.3.1 APK and clearing its app storage fixed the launcher crash.
Make a full recovery backup first. Boot into custom recovery, connect the phone via USB, and run all commands from a computer terminal (Windows/macOS/Linux) using ADB.
1. Fix Wi-Fi
The config file was already in the ROM, just in the wrong path.
Both fixes survive a factory reset (stored in /system), but are lost if /system is wiped or reflashed. Clearing launcher data is only needed once, right after replacing the APK.