I’m interested in purchasing a XIAO, but I’m unsure whether the ZMK firmware supports ESP32C3.
Hi there,
Of course it is NOT listed. So.,
Did you look at their “Supported Hardware” page , I did…
Wouldn’t want to spoil the fun of the hunt, but
Spoiler ALERT!
I found a spoon… LOL 
Seeed XIAO Interconnect
The Seeed(uino) XIAO is a popular smaller format micro-controller, that has gained popularity as an alterative to the SparkFun Pro Micro. Since its creation, several pin compatible controllers, such as the Seeeduino XIAO BLE, Adafruit QT Py and Adafruit QT Py RP2040, have become available.
Boards
-
Adafruit QT Py RP2040 (Board:
adafruit_qt_py_rp2040) -
Seeeduino XIAO BLE (Board:
seeeduino_xiao_ble) -
Seeeduino XIAO RP2040 (Board:
seeeduino_xiao_rp2040) -
Seeeduino XIAO (Board:
seeeduino_xiao)
HTH
GL 
PJ