Yes I have it connected via 4 bit interface. This is a special kind of ST7920 module, which has physical dimensions and pinout of standard 1602 LCD module, and in most cases, just works as drop-in replacement.
So far, I've figured an easy ways how to use LCDOUT to display all extended characters and features for this display. The graphic mode remains a mystery. My idea is to develop a PBP code, which will allow to use this module with existing 1602 LCD codes with as less modification, as possible.

I will try your solution today later and will write back.