I think you're mixing your metaphors a bit here. In any event, using a jailbroken phone when your company IT policy requires otherwise is NOT akin to robbing a bank. It's not illegal to have a jailbroken phone. Violating company policy may get you fired, but that's a risk that the individual will have to weigh in determining whether to make the violation.
And you would not be violating a SOX compliance "law", either. Companies satisfy their obligations in this area by establishing policies reasonably designed to do what they are supposed to do, e.g., data protection.
In any event, I have to believe that xcon would have been updated by now if its creators had any ongoing interest in doing so. I've been forced into 7.1 so it doesn't really matter one way or the other to me.