Combine the Diet Coke and lemon syrup in a medium saucepan and sprinkle with the gelatin. Allow the gelatin to soak for a minute or two. Heat over very low heat until the gelatin is dissolved, stirring constantly, about 5 minutes.
Remove from heat and add the liquors, stirring well to blend. Pour into a 9″x9″ pan and refrigerate until fully set, several hours or overnight.
To serve, cut into small circles or squares. Thread a small lemon wedge onto each bamboo skewer, followed by two small jelly shots. Refrigerate until ready to serve.