I think you could easily get the same effect on the Swag unit simply by welding some round rod onto some 3/4 flat bar and replacing the fingers with it. You might have to customize the lower die, but they appear to intend the die you linked to be a coining die, and that consumes a lot of force, I suspect that with the right lower die opening and depth you could make a good smooth radius by air bending like the Swag does.
The lower die you linked seems to be a bunch of laser cut craziness that adds little or no value to the function of the tool but costs much more to produce.
Is the goal to have tools that make what you want, or tools that look like they belong in a Steampunk shop?