I didn't think I would ever have reason to contradict your advice
Yes sorry I wasn't thinking straight. 
I forgot about the higher that Vcc input capability (it is quite rare)
I would also put a resistor from the emitter to the base to ensure the transistor (or FET) is turned off.
If you are using a FET the there is no need for a series resistor at all because any gate charge current excess is controlled by the constant current output. Note that with the constant current output you will not get 20mA (or what ever you set) if the load and voltage will not produce it. Instead it will just be turned hard on to ground.