How to move users to a new Mobility server

We want to move a group of users  (currently synced to Mobility through an LDAP group) to a new Mobility server running Sles 15 GMS 18.2.1. Current mobility server is  SLES 12 SP5 version 18.2.1 using self signed certs. The new server would be using a wildcard cert purchased from a CA.

So in the end, we would have two mobility servers, (an LDAP group for mobility users basically assigned to each server).. obviously the new server has new DNS name and IP. 

We use CISCO Meraki as an MDM if that matters.

What is the less painful way to migrate to the new server for both myself and end users? Just not sure how to approach this one.