Hello,
I hope you are doing well.
Did you know if the Wi-Fi extensions will be able to work in the Adafruit Feather M0 WiFi ?
If that is not possible maybe it is possible to use Adafruit HUZZAH32 - ESP32 Feather (currently supported by uLisp) and somehow bridge it with an Adafruit Feather M0 so this last one is able to reach internet?
Best Regards