Draft from a curved surface on angle

The attached file shows a design problem that causes me night mares every time we design a package with this type of profile. On straight areas there is no drama however at the "nose" area it very complicated getting a true straight draft surface at 6 deg. This I have done in the past by plotting
tangent sketches at various points and creating a surface and then blending back to the main body.
Would love to hear any ideas you may have

Regards, Trevor (Zevel)