Your beetle weight motors will only draw a few amps so you should be fine- I think you will need either an H-bridge microchip or some mosfets to control your motors though. Your other option would be to make the microcontroller control a normal esc.
You will also have to reprogram the microcontroller bit it says that is possible. I assume you are able to put inputs on that microcontroller which you will need for reading the signal from the receiver and from your accelerometer.