Mikrokopter project I2C to PWM or PCM

Hello

I apologise in advance if this topic has been raised before, but I am new to this forum.

For those of you who are familiar with the Mikrokopter open source project I need to replace the 4 addressed brushless controllers with 1 or 4 Arduino boards that will convert the I2C bus signal into PWM or PCM signals on 4 separate servos. The firmware that is loaded into the Arduino board must be able to be 'read' by the flight control firmware on the flight control board so it 'thinks' that it is still reading 4 brushless controller boards.

If this does not make any sense or you need further information please let me know.

Many thanks
Steve G