Reverse face U-direction maintaining the normal direction

Hi there,
I have a closed Brep, and I would like to reverse some of the faces in U-direction but keeping the normals outwards, this is important for the CAM software which I used for CNC milling. I tried to reverse the underlay surface and then create a new BrepFace like this :

var s = f.Reverse(0, true);
 Brep bf = Brep.CreateTrimmedSurface(f, s, 0.01); 

however, the Brep is always turns out “Inavlid” , is there another work around?

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