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A forward rake can be helpful (see my avatar) but it would have to be pretty radical to rotate the roofline up to The Template. You will probably be constrained by that side skirt kit.
Keep in mind that The Template is half-circular in cross section. It's more like a guideline. Some car get away with a seemingly too-fast roofline, The GM electric EV-1 for example.
You want the air that flows along the edge of the roof to stay there. If the roof falls off too fast, like a VW Beetle, the air on the side spills up and over onto the top creating vortexes. If a roof was flat on top, but tapers too fast on the sides (I can't think of an example), the air would roll off the top onto the sides and create vortexes there. So the taper of the sides and the top need to be copacetic.
By being half-circular The Template minimizes the problem, then managing the curve's fall-off keeps the thickness of the attached, turbulent layer as thin as possible.
A row of tufts along the edge of the roof would be instructive. They shouldn't pull up onto the roof or be plastered onto the sides, but point along the edge.
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