Adding draft along a radial bend

[knuckleuppunk]

Hey forum members, new guy here looking for a little bit of help. I have a tube that I've created with multiple bends in it. I am trying to add draft to the part where one end of the part starts at 3" OD and the other end finishes at 4.5" OD (long taper over the entire length of the tube). Obviously I can add draft while extruding a straight section, but how does one do it when revolving a bend around a centerline? Is there a way to add this draft to the finished part using just the draft feature? An example would be to draw the tube at 3" OD from start to finish and then add the draft afterwards?

Any suggestions would be greatly appreciated.

Thanks!