I have discovered a person in NZ who has made just this type of competition and is willing to allow us at Rugbyrefs.com to use it for a very reasonable cost.
We'd like to trial it out first, so if you could please go to:
You will need to log in with this site, I suggest using the same credentials as here so we know who each other is.
Once you log in, you can add predictions for the ITM Cup & Autumn Tests (These are one comp) and the World Cup.
I'll let you know how to join the private RRF League once David sets it up.
David has also joined RRF so if you have any questions or requests, I'm sure you can post them here and he will se to answering them.