Certainly works well.

This definitely benefits from the addition of 5ml simple syrup to bring everything into a lovely balance.

Can't taste the Creme de Menthe? Well, the whole is always greater than the sum of its parts. Our advice is not to up the Creme...it will ruin the balance. A sophisticated Margarita.

For us, this seems intended as an aperitivo, as the Negroni is. So we eschewed some commenters' apparent desires to do a makeover of it as a digestivo. We wanted it light and floral and so used Never Never Triple Juniper Gin and Maidenii Sweet Vermouth. A beautifully balanced cocktail.