I’m gonna try one of these Arduino Nano knockoffs: Upgraded /NANO V3.0 ATmega328 Extended Compatible for arduino ATTINY88 Micro Development Board 16Mhz /Digispark ATTINY85. They seem to be an ATtiny88 in an Arduino Nano form factor.
There are cases for the Nano, but they’re not cheap: Zebra Classic Case for Arduino Nano.
I’m planning to get a bunch of these: 0.56 Inch 7 Seven Segment 4 Digits Red Clock LED Display Common cathode Time 12 Pins. Then I need to figure out how to drive them from an Arduino Nano…
// 2022-09-24 jj5 – actually, these might be better: 0.91 inch OLED Module White/Blue OLED 128X32 OLED LCD LED Display Module 0.91″ IIC Communicate For Arduino ROHS Certification.