Not having or even knowing where to get Combier, I subbed 1 dash of orange bitters and 1 dash of absinthe. I think it turned out very tasty, though of course I have no idea how similar it tastes compared to the original recipe!
Very interesting in a good way. Like the mixtures of the flavours, but I may tone down the vermouth to 1/2 oz next time. I found the vermouth a bit strong.