<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Maybe my CSR was just a stickler.</font>
Or uninformed. I know of dozens of folks that have upgraded using the new Systemwides without them being issued yet. All they way back to a few days after they were announced, too.
It's just like any other E-Cert (CR1s or 500 milers)...you don't have to have them in your E-Bank to confirmed under them. You just have to have them by the time you fly.
A United system profile exists for the new Systemwides (was loaded I believe the day after they were announced) and someone even posted that new profile code in another thread here on FlyerTalk. So the agent can get all the booking codes they need from that.
Just call back and get another agent.