What is your tolerance for the surface edges ? I tried lofting and adding a 0.05 radius curve to the angular corners, then increased the control points to 100 and the loft was very close. You can’t avoid a kink at the corners, other method is to sweep two lines taking mid points from the last curved profile in the bend and mid way, make up that final section with four surfaces. Very accurate but not a smooth transition.
I’m not a power user so more elegant suggestions may be offered.
The curves are not parralel to each other, is this also intentional ?