TO conver to a standard RX you would need 2 ESC's one for the Main motor and one for the tail rotor, and a gyro, much cheaper and easier to get teh correct RX for the heli.
It is niot just a matter of replacing the 4 in 1 with the items they all have to be set up to work together, and the tail motor control is a real hassle.
Get teh 4 in 1 for teh Honey Bee CP it should work fine. Ido belive you could also use the E-Flite Blade CP, but I am not sure about that.
The new RXwill not come with a crystal, you will use the one in teh old RX that came with the heli. That way you have a matched set.