Puzzled how to build this special kind of extrusion

I need to extrude a letter with draft angle from the front plane to a curved surface. The issue is that when I do the resulting letter is distorted on the top, curved surface. In the attached part you will see what I mean. The extruded shape is not what I want. The blue curve is the shape I want at the top, curved surface and then extruding down to the front plane with a base that is wider than the top (10 degree draft). I am at a loss to figure out a way to get the shape I need while controlling the top surface outline and maintain a 10 degree draft angle.

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