Migrate RHEV Manager

We're looking to migrate our RHEV Manager.

In the process we will change the FQDN (and IP), change the ports to 80 and 443.
Has anyone done this and have all the steps and requirements?

I guess it's more or less:
1. Setup the new RHEVM-host and install RHEVM with the new config (e.g the new FQDN and ports etc).
2. Import a database dump from the existing installation.
3. Remove and add the hypervisors (to get the new certificate).

Am I missing something?
Is it possible to do this without downtime of the virtual machines?