Hi James,
The Constant Current part usually is before the Voltage adjust and usually directly controls the V_out.
If you put it after, then it's a lot harder to keep V_out fixed with varying OP current, due to losses in the CC circuit.
It can't just current limit, that will bring down the V_in voltage to the V_out circuit.
So, you need a S/Mode design that either has Current limit Input pin or a flexible V_out pin.
It's a heck of a lot easier with a Linear design, but I'm NOT suggesting you go back to linear.