I'd recommend the normal, raw shrimp cycle. Sounds like you might be looking for a shortcut, but I've found the easiest way to mess up and waste money and time is to take shortcuts. Take the 4-5 weeks and I think you'll be better off in the longrun. Folks have used Bio Spira and put fish in the following day. It's just that I've seen so many mess up adding too many fish. This is a very exciting hobby and its REAL hard to take your time. I know that too.
Best of luck. 8)