Using braindumps of any sort to pass the test is only going to hurt you further down the road. I'm sure that they would not look favorably upon you if you did/said something obvious to call attention to the fact that you had used one.
You could likely do this with one of the linux firewall distros like ipcop or smoothwall. Just setup an additional interface for the less secure wireless connection and place whatever specific limits on it that you need.