In the Arduino schematic, for some reason pin 2 on the NINA-W102 is labeled "GPIO34". At first I thought I was mistaken, and that pin 2 on the Arduino schematic really is GPIO34 on the NINA, but that ...

Should be able to be created at ~$40, with the ADG1611BRUZ being the most expensive component. Note that the DG1411EEQ is pin-compatible, with a slightly higher Ron. This requires an Arduino Nano v3 ...

Since the ATmega328PB was released, it has proven to be a better and cheaper MCU for manufacturing than the ATmega328P, the current MCU used by the Arduino Nano and clones.