Best practices for migrating iapp services to another F5

There are 3 iApps which have to be moved to new BIGIP and am looking for inputs how to migrate these applications one at a time to the new devices.The virtual server IPs will be the same.

Existing F5 : BIG-IP VPR-C2400 Host : BIG-IP 11.5.3 Build 2.0.196 Hotfix HF2 Guest : BIG-IP 11.5.3 Build 2.0.196 Hotfix HF2

To be moved to : BIG-IP VPR-B2250 Host : BIG-IP 12.1.1 Build 2.0.204 Hotfix HF2 Guest : BIG-IP 11.5.3 Build 2.0.196 Hotfix HF2

Below is the action plan i have in mind:

1. To migrate an iApp from one BigIP to another we will redeploy the iApp template on the new device.
2. The iApp will create all the corresponding Virtual Servers, Pool, Pool members, profiles etc.
3. The SSL certificate will not be duplicated and we will have to copy the existing certificate of the websites and upload them on the new devices in file management and call it in the client profile.
4. The routes have to be checked and if and any missing routes have to be added.

Looking for more inputs and suggestions. Thanks!