You can re-assign license to the IP of the New SMS in your Check Point User Center after successful conversion.
When you are asking about replication of the manager, are you referring to Management HA or the replication of the VM?
If first:
Prepare fresh deployment of the secondary management server with new IP and the host name.
In your new environment, delete secondary management from all rules it is referenced in and then the object itself.
Save database and push the policy.
Create new management server object and establish SIC with it.
Sync the management servers.
Add this new object back into the rules it was previously removed from and push the policy.
If you need to have replica of the logs on your secondary management server, define it as the destination for logs in your gateway objects and push the policy again.
If you are referring to the replication of the VM, it is a different story altogether.
In this case, I would've configured your management VM differently:
1. Configure a routable (RFC 1918) /32 loopback address in Gaia and assign licenses to it in the User Center.
2. Add two more interfaces to the Management Server in Gaia, one that belongs to the network in Primary and one to the network in DR.
3. If you are using dynamic routing in your environment, advertise the loopback IP via OSPF, RIP or BGP via both ports.
4. If you are using static routing, establish static routes to the loopback address at both locations pointing to the IP of the physical interface of the SMS in corresponding network.
5. Configure secondary default route on the SMS in Gaia to point to the IP of the gateway in DR with lower priority (higher number):
6. Replicate this VM to DR site.
7. Power down VM in Primary
8. Power up VM in DR
9. Once you've confirmed that you can access the management server via its loopback interface in both sites and that you can reach your gateways from it and it from your gateways (SSH), power it down in DR and power up VM in Primary.
10. Establish SIC from this SMS to your gateways and push the policy.
11. Delete the replicated VM in DR.
12. Setup scheduled replication of the VM to DR.
*Note that in this case, your logs on the replicated SMS will be trailing by delta between last replication of VM and the time it is powered up.
**Note that you should take care not to have both VMs UP, especially when using dynamic routing.
Cheers,
Vladimir