Well, the Astral Doppelganger ritual requires you to have Flexible Signature. The Flux metamagic would let you sneak through without needing a ritual.
I've always hated the way they worded the "press through" wards action. It implies that doings so means that you move through undetected. But the first sentence of Fooling Wards, explicitly says otherwise. And if anyone could press through a ward and be undetected, why are there initiated skills for doing it?
I think it is perfectly reasonable for getting through a ward completely undetected to require specialized training. We're talking about a magical defense that is literally designed to keep magic out. If any untrained schmo can get through it, what's the point?
One thing that a lot of people overlook for the uninitiated is that wards only stop magic. If you turn everything off: deactivate foci, stop sustaining spells, etc. it doesn't do anything to you. An uninitiated mage just needs to step through and recast his stuff...