idea...
you have 6 channels, and as its a baiter. it will probably steer like a tank, ie: one motor stops or reverses to make a turn.
plug your esc's into ch1 and ch2, then enter the menus's scroll down to mixing and engage ELV mixing you can then use ch3 to work one servo for hopper 1, then ch6 to work the servo for hopper 2.
I have manually isolated channels on nord icelandia, so i can function lights without functioning the stern frame. this gives me another idea. two springloaded switches either side of a servo.
working diagonally across the servo, use the spring loaded switches to break into the red and white wire of a servo extention lead. this will go back to a Y-lead from ch5. use ch6 to work the servo to press the spung switches, and ch5 to function the hoppers. up for up, down for open.
you can have the servo centred, and the doors closed, flick the ch5 to down, then rotate ch6, that will swing the servo to push the switches. once they make contact, the hoppers will spring open. rotate ch6 the other way, and it will close the other jhopper switches and *bang* second hopper drops its bait. flick ch5 back up, the hopper will close, rotate ch6 till it contacts the fiorst set and that hopper will close.