A centre combination of Ikitau and Petaia could be interesting, and and at the very least more threatening than with Hodge. Ikitau's distribution game is underrated, especially his short passing (he hasn't really had any opportunity to show it for the Wallabies this year) and his left foot would be an asset.
This weekend might not be the best opportunity to test it, but it's something to consider post World Cup, especially with it looking less and less likely that Kerevi will sign for a Super franchise and Paisami's development has stalled.