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As much as the simpler original is delicious, I also decided to make a version with Gran Classico and Cynar, along with Appleton 12 and lime juice. Rather far enough from the Paper Boat to be a different drink, but quite tasty nonetheless. The rum stands up to the liqueurs, and there is a lot of depth and complexity.
I made it with the original equal parts proportions, using Redwood Empire Lost Monarch as it already blends bourbon and rye. Overall I agree with Caspian Berggren's assessment below. I also added a couple of drops of saline about halfway through, which balanced out the herbal character from the Montenegro with Suze's earthiness.