Posted by Tolyan009/TlnNeun here.
This is a very simple version with minimal modifications for the OnePlus 3/3T. I did it a long time ago, based on Arnova8G2's development. I don't remember if something doesn't work, although at first glance everything seems to be okay.
I'm sharing it as it is. Only for Android 9.
I have updated the file name (replaced "+" with "-") to avoid issues with my file hosting.