[Chetan Patil] from CreatorBot built a breakout board to help attach either the ESP8266 WiFi or the HC ... Maybe use a digital signal from the Arduino Mega on the RAMPS board to keep the ESP ...

As usual I’ll be using a NodeMCU board (I really did order a lot of them) which uses an ESP8266, but there’s no reason this would be difficult to achieve on an Arduino-based device.