I should have mentioned, that build specifically was a stock Zynthian “Gorgona Omega” SD-image, configured for Kits v2 image using the official Raspberry Pi 7" touchscreen display.
Since all GPIO pins are available (ignoring how you choose to power the screen) its a simple "connect it up and change the Hardware/Audio via the web tool to “HifiBerry DAC+ light”. The instructions are identical to the existing * Build a simple Zynthian using only a Pi, the official RPF 7" touchscreen and a USB audio device, but I it worked after several attempts at USB (without knowing comments others made about being careful of what else is plugged into USB and in what order – oops). I’m not even sure I used a fresh image when I got the PCM5102a board working.
I’m actually going to attempt a new build using a 5" HDMI/touchscreen and a variant of the same PCM5102a board and see if I can get it going without hooking up the LCD pins like the troublesome GPIO18 that conflicts with these cheap sound boards. If I get that working, than yes I’ll be doing a write-up