It seems like a lot of work for something so.. pointless? You can just put your jobs in an online randomizer and have that pick for you. Not many people at all are stuck between 3 or 4 jobs because generally people have their own preference with classes and play styles. Also, they'd have to have 3 or 4 classes at similar levels for this to even work, which again, not many people have as people tend to level one thing at a time.