You might think of it as a belt-and-suspenders (braces) approach or you might think of it as a gigantic, multi-entity CYA operation -- but it ain't gonna happen any other way.
Exactly, any solution will be way in excess of what should have been done in the first place and far in excess of what actually needs to be done. Think cast iron, fireproof, waterproof, bullet proof and most importantly LAWYER proof. Nothing will be signed off until all the experts give it the okay and they will make sure they have covered themselves.