I agree about brewing a simple beer. It would be easy to overpower the taste of blueberries. I brewed a blueberry ale as a party favor for the adults at my daughters frozen theme B-day party. I made a 5 gallon batch of basic blonde ale with east kent goldings and added 5lbs of blueberries to fermenter. The color was great but the blueberry flavor was not very noticeable. I don't know if a syrup at packaging would be better,but if you are making a 5 gallon batch, it may not be enough blueberries to contribute flavor. After talking to another brewer he told me he uses real blue berries to get the color, but blueberry extract to get the flavor. We aren’t big fruit beer fans so I never tried it. You could try that.