I made this with Chazalettes Vermouth Extra Dry Vermouth that I had hanging around. Nice. I made it a second time, where I slightly reduced the Vermouth and compensated with some Amaretto. Very nice. Hope folks try it.
As per below, I like this. But maybe a tad sweet. I made another version, where I cut the chartreuse and benedictine in half, and made up the difference with Byrrh. Very nice. I hope someone tries it and comments on the variation.