Upgrade NBU clients 6.5 to 7.5 and move to new master server (which is of course 7.5)

Dear all,

I would like to seek your help regarding this.  So let me itemize my goal here.

1. I have 10 RHEL servers with v5 & v6 with NBU client 6.5 - I need them to upgrade to 7.5
2. Move those 10 clients to new master server - nbumstr.bck.tld

I use the following steps though :(

1. Stop NBU client services/processes
2. Move the folder (serve as backup), # mv /usr/openv /usr/openv_6.5
3. On master server (6.5), remove those 10 servers on the list
4. Add these 10 servers to new master server (7.5)
5. Execute, # install_client_files sftp istanbul.ad.prod.tld sysad
6. Install software on client: # sh /tmp/bp.{number}/client_config

What is the more efficient way to do it? Is there some tool that I am not aware of that could simplify this?  Thanks a lot!

BR,

Michael