"Hidden scrum" within waterfall so as not to rock the boat (pardon the pun) can only take us so far. What if, by way of subterfuge, our system administrators (regarded by me as product owners) started to to incorporate User Stories to their Functional Overviews without even knowing it?
Yes, that's right. Subterfuge.
My approach to bringing Agile into the corporation is both top-down and bottom up. Writiing user stories as part of the FO is clearly bottom up, showing each product owner the value of laying out in short statements what it is IT needs to build.
Meanwhile, meaningful reports to managment using Axosoft's reporting system helps with management.