I'd recommend against it. The main reason being it is a "gimmick" and aside from the fact that you can say "primed with candi syrup" to yourself and your friends that small amount of candi as priming will be barely noticeable if at all. So why risk it? In fact, you could just tell yourself and your friends "primed with candi syrup" and as long as you and your friends believe it it will
taste like it's true even if its not!
That's way better than having undercarbonated beer, IMO.