My understanding for a low alcohol beer (I don't think you can make it completely NA) is that you heat it to boil off the alcohol, is that right? Then, when it's cool, you'd have to add a tiny bit of yeast along with the priming sugar to make it carbonate in the bottle. I think that's what the OP is saying.
I'd buy the carb tabs, but I think there is 48 tsp in one cup of sugar. If you usually use 3/4 of a cup of sugar to prime, that is 36 tsp of sugar, right? So, you use 36 tsp sugar for 5 gallons (640 ounces). So, that's about 3/4 tsp per 12 ounce bottle (actually, it's .68 tsp per 12 ounce bottle).
That doesn't seem like much at all- so please check that math!