16MB CH340K Chipvariant
As I won't order PCBs online (and specific SMD sockets as shown in soldering instructions video) and just use what I have at hand, it will be assembled on a perfboard I had in my drawer for years.
TTGO T-Display MH-Z19C 5V VCC GND GND D26 RX D27 TX
D12 on the TTGO has to be grounded but it's not obvious why
https://github.com/revspace/operame unmodified, had to install vscode (vscodium doesn't have platformio in its openvsx store) and the appropriate driver on Windows so platformio could flash the TTGO T-Display onboard ESP32
Initial proof of concept with breadboard, everything works perfectly.
Then perfboard implementation. A first for me, quite the hassle, I probably didn't go the easiest way with the solder traces and then the cables on the back. A multimeter with continuity mode is a must have to ensure there's no short between traces.
Next time, solder traces are not worth the time and headache and cables should just be soldered through holes with a single solder joint to the next hole.