I think the only Feathers which don’t support CircuitPython are the ESP8266 and ESP32 Huzzah boards. The new ESP32-S2 chips will apparently get a CircuitPython Feather but that’ll not be until Adafruit go back to normal after Covid, whenever that will be. They do make Airlift expansion boards for adding WiFi, but double check exactly what you want to do first, some task need a decent amount of RAM and Adafruit recommend something like an M4 board for using these with CircuitPython.
I can’t think why the board would need an M4, but they’re not that much more expensive and they’re capable of a lot more stuff.