Having been served in North Carolina an un-named cocktail containing inter alia Rye, Chartreuse, and Averna, I searched for similar confections, and found The Pledge at the cited source.
I made both the original version, and the adaptation described above - although I made both with Bulleit Rye.
I think the two drinks are sufficiently different, that the original version should be listed here as The Pledge, and the version posted here in 2014 be given a slightly different name, or listed as a variant.
The Benedictine version was both smoother and sharper than the Averna version, which seemed to be richer and less herbal. The mouth feel of the original version is more substantial, also.
I thought both versions were good, and I will probably make one or the other again, at some point.
Curated this drink - from a user comment, I reverted this to the original recipe at the cited link and added the substitutions in the notes. Also, I cleaned up the instructions, added the garnish and date. Thanks, Zachary