I don't know anyone who has tried to make the flavored creamer. I've seen a few people try to mix the portions of half and half and the syrups directly into their coffee. Some people get it just right, and some people
aren't very happy with the results.
Since you'll be experimenting, rather than make a big batch and risk not being happy with it, try making a smaller portion to see if you like the results. A smaller ratio would be one teaspoon of chocolate, one teaspoon of caramel, and 4 ounces of half and half. Write down your results and then add more or less until you get it just right. Just remember that The International creamers may have added ingredients in them that could alter the taste. You won't get it to be a perfect match, but you'll eventually get it the way you like it.
Rose