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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@veryalien
Lo and behold, after about 5 minutes of wiring to a breadboard and a black hat hacker... the GFX HAT LCD is working!
Wired up as described on pinout.xyz to your example ST7565 Pico setup.
The setContrast seems to be a bit binary at the moment, it's completely off or completely on. That had me worried until I tried setting the contrast myself, and then I could actually see something.
EDIT: Methinks I'm doing something wrong with the setContrast and the resistor divider parameter, but I've got it going from very faint through to completely black which shows that it's working.