OK, so I bit the bullet... It seems that if you reopen ArcMap, the toolbars disappear. So it looks like if you uninstall the 10.0 Add-Ins, close ArcMap, and run the 10.1 Add-Ins, that appears to work OK. I was able to add IDs used in the relationship classes for the address points and centerlines with the Attribute Assistant after that. Not sure about the AddressManagementConstructionToolsInstaller.msi, but you cannot run that again (looking for an uninstall option) if you have already upgraded to Desktop 10.1. if there is a better way or if your experience has been different, I would be interested to hear...
Thanks,
James