Support for the ESP32-S2 (via CircuitPython) is underway, with the first tested device being the
PixelWing ESP32-S2 RGB Matrix. This will be compatible with the existing OBS script, so you can mix and match Raspberry Pi or ESP32 devices depending on what you have in your parts drawer.
With the release of Oak Development Technologies' PixelWing and CircuitPython 7.0, this will be the simplest (and cheapest) way to get a network-connected tally light going. After development and a few weeks of field testing, this will likely be the target platform for the TallyPi going forward.
So I guess TallyPi is becoming... TallyESP?