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Responding to previous commenters, we think that the sugar syrup is absolutely necessary here to integrate the other ingredients and bring everything into harmony. Use as little or much as is to your preference but without it we think that the drink is in danger of disintegrating into a disparate clatter of spirit and liqueur. We loved it as specified but can understand why some might wish to reduce the syrup just a bit.
Perhaps those espousing no sugar syrup might wish to experiment with bitters as a bridge between the other ingredients and let us know of their successes.