I did this with 1 Oz of whistlepig Rye and 2 Oz of Dolin sweet Vermouth and it's absolutely phenomenal. Use a higher proof whiskey if you do this, it'll help it shine through the vermouth and balance the drink properly. I will happily make this again.
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.
The comment in the article describing this as "just what it says on the tin" is bang on. Without wishing to sound rude, this is probably the most unremarkable cocktail I've ever had on this website. It was made a lot more interesting with an ounce of rye, but even still, I just can't recommend it. You can do so much more interesting.
Comments about this being too sour make my head spin, I found this too sweet, and that was with Luxardo Espresso, a much dryer coffee liqueur. That said, this is a delightful, delicious Margarita variant and I really dig it. 2-3 barspoons of agave syrup is what I'll use going forward.