Lacking Irish whiskey and inspired by comments, I improvised with the following:
45ml Monkey Shoulder
15ml Carpano Antica
7.5ml Green Chartreuse
2 dashes of orange bitters
The result? A nicely balanced cocktail where each ingredient's flavor stood out.
I liked the sound of this, but didn't have Irish whiskey so I subbed in Japanese blended whiskey. It was a solid 3.5/5, and for round 2, I used the original equal parts recipe and it was even better, 4.5/5. Definitely one I'll try again.
Maybe something for a friend who is not into cocktails