Maybe a option is to push the whole club rugby season back a bit later, this year Super14 players were able to join club rugby from late May/early June depending on whether there team made the finals or not. In 2011, Super Rugby players will be able to join club rugby from late June/Mid July depending on finals. In 2012, with the expanded 4-Nations, Super Rugby players wont join club rugby until August, only a couple of weeks before the finals.
Why not push club rugby back so the finals are in early November, sure it will be hot, but it will be no different to the club rugby season kicking off in Feb as it does now.