First, make the simple syrup because you'll want it cool for the cocktail. In a small saucepan, bring the water to a boil and then add the sugar and cinnamon sticks.
Stir the sugar in until entirely dissolved, then lower heat and simmer (not boiling) for 10 minutes.
Allow to cool and then discard the cinnamon sticks before storing in the fridge (it'll keep for a few months).
Add the gin, Chambord, lemon juice, and cinnamon syrup to an ice-filled cocktail shaker (and allspice dram if you have it). Then add all the bitters, the vanilla, and the spice.
Shake well and strain into a chilled old-fashioned glass with a single large ice cube.
Flame a 2-inch piece of lemon peel, wipe it around the rim of the glass, then drop it in as a garnish. Or go the route I did, and flame a cinnamon stick and add as garnish.