One of the best cocktails ever, it has a reason there are so many variations. Today I tried a split base of lemon and lime which I can suggest to try. Usually I reduce the Maraschino a bit accodring to my personal liking.
For all people with difficulties to get hold of a bottle Chartreuse vert I suggest Boomsma Klosterlikeur. It is not as strong, but the most similar I could find until now.