Not sure I understand. Right now you should have dual stack, which should be easier than merging the v4 onto the v6 network. You didn't have to change anything to keep working with v4 and if you want to work with v6 then that's an option for you but you can disable if you really want.
I'd like to use v6 in the dual-stack setup, with all the v4 addresses copied over so that there's no visible change. I'd just be using a different protocol under the hood, similar to how upgrading DNS or HTTP versions didn't change all the URLs.
