You can do that with NAT64, which you can run as a service in your datacenter rather than needing to deal with v4 throughout it. (In fact it doesn't have to be

You can do that with NAT64, which you can run as a service in your datacenter rather than needing to deal with v4 throughout it. (In fact it doesn't have to be run in your datacenter -- it could be outsourced to somebody else, which will probably make sense eventually as v4 use dwindles.)