You’re right in concluding that a little maple syrup is not problem. A teaspoon is about 5 grams with an FP of approximately 2 grams. The only problem is just having one teaspoon – it’s delicious. Also if you happen to be a fructose malabsorber, the effective FP will likely be a bit higher. Theoretically, GI determinations are done in healthy people, though some subjects are likely fructose malabsorbers since they don’t routinely screen for it and it’s quite common.
Unsweetened coconut milk has an FP = 0 grams.