This is such a low IBU beer, I wouldn't worry about it. But, you could make up the bittering AAU with Saaz and not worry about the AAU for flavor & aroma as they go by go by weight, not AAU. The flavor and aroma oils are more or less independent of the AAU, so using a little extra Saaz in for bittering would have the least impact on the overall flavor.
Utilization is very time dependent, so the exact numbers depend on when you make the flavor & aroma adds.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
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