Out of interest, why did you think the Pico + ESP8266 wasn't suitable? It would have had FAT and Graphics built-in.
@Gordon started
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.
Out of interest, why did you think the Pico + ESP8266 wasn't suitable? It would have had FAT and Graphics built-in.