I've had success making biermuchers centenial blonde and racking it over blueberries in the secondary. Ive made this beer using anywhere from 6(moderate blueberry flavor) to 12 (holy jesus blueberries in your face) pounds. I preffered the lower end of the spectrum, but there were folks who tried all the different types who loved the almost wine-like 12 pound version. 6 is closer to real sweetwater blue. Its really your call
No matter what this doesn't come out exactly like sweetwater because it uses real blueberries where sweetwater doesnt, so it's more alcholic and gets a cool purple color with an almost pink head. So not the same, but the same idea. It's good stuff. It may be more like real sweetwater to just kill the fermentation with campden tablets and then add blueberry juice at kegging(if you keg), but i havent tried that.
One important note: use a blow off tube when you rack to the secondary-- the blueberries just go crazy immeadiately, and, trust me, its not fun to clean the purple goo of an exploded airlock off your ceiling.