So it seems that com.hmct.epd.EpdManager.forceClear is the function that calls the full refresh. And it can be triggered by adb command "adb shell service call epd 21". See here:
https://forum.xda-developers.com/t/h.../post-89036219.
What kind of other values need to be found for there to be a working driver?
Is there a specific path one can take to find out such value/commands/etc?