Yes defiantly you can do this. XIB are just files too just open one in a texteditor - you'll see that it consists of readable xml code. now for making viewController compatible with Iphone 5 just put if else condition and make thing separately for different devices by checking height of particular device
but defiantly its going to be long job
For my universal app, Forex App, I'm simply using the screen height detection concept like so:
CGSize screenSize = [[UIScreen mainScreen] bounds].size;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
if (screenSize.height > 480.0f) {
/*Do iPhone 5 stuff here.*/
} else {
/*Do iPhone Classic stuff here.*/
}
} else {
/*Do iPad stuff here.*/
}
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