End profile of extrusion

Hi I’ve got louvers extruded from curves and i want to change the end profile

The left side is the current profile and i want it to be like the right side.
Ive tried deconstructing the brep but the filleted surface reads as one and does not break into curved surface-flat surface- etc… Please help!

mandvi2.gh (21.6 KB) mandvi 2.3dm (4.2 MB)

mandvi2_Re.gh (14.8 KB)