If you don't found any other cities until after the flip, you don't end up having to give Rome up. Of course they'll declare war sooner or later, but you'll be ready by then. And they'll just collapse with pressure coming from up north--essentially they are your shield against barbs.
This does not work for m because the always get warped to Sicily, where their culture annoys Rome and whatever North African cities I have, and the northern mess kill me instead. x.x