I skipped the garnish listed and went with grated nutmeg and orange zest, I thought it was great! I'm not sure how you can read the ingredients, make the drink, and then say it's too sweet - of course it's sweet. With a dry coffee liqueur and a high-rye whiskey, you'll still get a really well balanced drink
Tried it the original way first, and I'm not sure if it's just my orgeat but I didn't really like the flavor/sweetness of the drink.
Made another with some different specs: 45ml whiskey, 22.5 ml espresso, 15 ml coffee liquor, 15ml demerara simple, 7.5 ml maple syrup. Enjoyed that one much more.
I think in all equal parts, this drink may as well be a variation on a white Russian, for all intents and purposes. Probably work better like Evan said, with half the orgeat and coffee liqueur. Maybe even all equal parts but double rye, as the rye was effectively annihilated in this.
It is a great pick-me-up coffee cocktail in the afternoon. For ones have no problem of falling sleep, this can be a dessert drink after dinner. It may be a bit sweeter for some, a pinch of salt is magical. I used cacao powder for this run.