I'm sending you a piece made by sketching and not with a succession of broken lines in the sketch.
With this method you can carry out any cutting or operation (material removal, new folding, extrusion etc...) AND of course the unfolded ones work. On the other hand, the attached file is in 2021 SP2 version + screen images
To make your basic shape. Make a sketch with a radius to then make a real configurable sketch that will allow you to choose the number of facets, + other very complete options. See pj
It reminds me of a similar problem, it was a pinned tube with embossed rib where it was not possible for me to model with the shape tools since the part was not developable, and contrary to this subject, these shape tools were essential for my case, so I wonder if SW has brought anything new on this case, If only @Le_Bidule@TONIOyou could do a simple :) test.
Vincent, this is the problem I pointed out above, if you make the finished piece it will not be foldable, and if you go through a flattening, it is not foldable,
That said, I see that you can insert plaice in the flattening without going through the shape tools, which is still not possible under SW18, so I deduce that they have started to make improvements on this point:)
To sum up, I doubt very much that you have to make 2 parts (configuration), a finished part for presentation, and another for manufacturing, i.e. project the positions of the holes if it's a punching (stamping), or add the sides if it's for cutting;)
In the shaft go up the function PLIER1 just below Enrem mat-Extru 1, then you redo your 2 sheet metal functions bent on edges. And you'll see how it works