How do you like the Genepy? That’s one that I can find pretty easily and certainly cheaper.I've been using Genepy for green (it lacks the orange notes, however, so maybe a dash of orange bitters would help) and Strega for yellow.
Speaking of which, I picked up an older cocktail guide from the 80s and it had a few drinks that called for orange Chartreuse. I had never heard of it before. It lead me here: Hunting for the Lost Chartreuse | PUNCH
I love the quote “It was an experiment, and not all experiments are good.”