Sheet Metal Part Starting From a Circular Tube?

I need to model a part that is made from a circular tube.  The end of the tube is machined with a complex pattern of barbs, hooks and tabs which are subsequently bent backwards, sort of like fishhooks or a palm tree. The problem is that I cannot figure out how to add sketched bends or angled flanges to circular edges.  If at all possible I want to model it via sheet metal methods so that I can collapse it back down for the machined pattern. 

Any ideas?

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