Yes it is possible. I've been working on the formula myself for some time now and I'm getting closer to perfection, almost 40 batches later!
What we know:
The liqueur is Cognac based
The liqueur is flavored exclusively with the peel of Bitter Orange a.k.a Seville Orange
The liqueur is distilled
The liqueur has some caramel in it
Their syrup is defiantly an invert base, due to its sweetness and mouth feel
So far I have come close, but there is always something missing. I believe that GM has a bit of undisclosed spices in it. I pick up clove some times when I taste it. Other times I pick up allspice or nutmeg. Yet still other times, I get ever the tiniest hint of fennel, anise, or angelica.
There is no juice in the product, this I am sure of. Any acidity would have to come from added acid(s) like citric, malic, tartaric acid, or some combination there of.
I have a batch macerating now that won't be ready for the still for at least a few more weeks. I will post back with results.
EuroStiller- The Doctor
"Don't drink in the morning, it leaves you with nothing to turn to in the the afternoon."