If it is OK to freeze it once, I doubt it would do anything horrible to it a second time. People feel the same way about meat and the like and it is generally unfounded. People do it with meat all the time because they don't realize things like sausage are very rarely made and shipped fresh(You've never had a Johnsonville, Premio, Jimmy Dean, ect sausage that hasn't been prefrozen because that is how they ship them, yet people refreeze them all the time.) It would be safe in any case. I've kept a rather large one in a zip lock in the fridge and used it repeatedly over a week. If it doesn't mold, it shouldn't be an issue. If it ferments.. well, who cares, it won't be much and it might even help the extraction process. The bigger it is the easier it is to knead in a large bowl in my experience, and I've used 6-8oz at a time in mine.