I had this drink a few weeks ago, wanted to try it for a long time now. I loved it !
I gave the bartender the ingredients since he didn't know this drink. He proposed me this version:
5cl of Calvados (I think it was Pays d'Auge)
1cl of Yellow Chartreuse
1 bsp of Bénédictine
2 dashes of Ango
it was pretty good and well balanced.
The "original" recipe (2-1/2-1/2) is obviously too sweet. I guess playing with chartreuse and bénédictine's ratios should be ok provided that both ingredients do not exceed 1/2 oz or 2cl
Again, this really is a great drink and I gotta say that I don't understand why it has been "forgotten"