I gave up waiting and wrote my own. All you need is a display driver which can change the colour of a pixel. Then you can create a line. With a line you can draw rectangles, triangles etc and fill them in. You can create text characters and draw them in different sizes. I did it because the displays I was using (Waveshare), in addition to early Pimoroni Pico displays, only supplied the driver and a very limited set of GFX routines.
You can build interactive displays like this, without flicker.
The current Pico Graphics routines now supplies the means to do all this for their boards but if you are interested in a ‘build your own’ system there is information on my Instructables site.
Tonygo2’s Projects - Instructables
and more information here:
Can you access FrameBuffer in Pimoroni PicoGraphics Micropython W - Support - Pimoroni Buccaneers
I hope this helps - I find computer graphics so much fun!