Moved to ePO for faster support.
Yes this the correct way but machine will back to existing ePO server. Do you want to report all machines to new ePO server after agent upgrade?
Yes, the old server will be decommisioned so all the new agents will report into the new server. How will it go back to the old server If I push out agent from new server ?
You don't need to 'Force installation over existing version' if you are deploying the same number. This process will only replace the SiteList.xml file, which is used to configure the server the endpoint agent is configure to connect to, and update the Server Key to enable the secure communication.
Certified Product Specialist - ePO