F5 - Journeys BIG-IP LTM Migration - GTM considerations

I appreciate you offering an alternative. I don't want to touch the production environment. Where I'm at now is I've built the tenant (vCMP Guest) running 15.1.10 on the rseries appliance and now I'm trying to import the UCS file. The first time I tried the device went offline and I think it's related to licensing. Can someone tell me what I need to edit in the UCS files i.e (bigip_config,etc) to ensure a smooth migration? I've already copied over the master key from the 5050 appliances. Now just having issues importing the UCS file with Journeys.

Any idea why I'm getting the following Error in Journeys:

Deployment stage 'Deploy UCS' failed with the exception: Extracting manifest: /var/tmp/install_all/plaintext.ucs Product : BIG-IP Platform: UCS : C109 System: Z101 Version : UCS : 15.1.5.1 System: 15.1.10.3 Edition : UCS : Point Release 1 System: Point Release 3 Hostname: UCS : old-hostname-F5-1.mycompany.com System: new-Hostname-F5-1.mycompany.com The system hostname is changed to old-hostname-F5-1.mycompany.com Installing --full-- configuration on host old-hostname-F5-1.mycompany.com Installing configuration... GETDBVAL: Lookup DB provision.restjavad.extramb GETDBVAL: Result >>>>> Unable to find variable: provision.restjavad.extramb <<<<< RU: No PRE; RU false; leave to default to 384 ATTENTION REQUIRED: Your previous configuration files have been archived, as listed below. If you customized any settings in these files before upgrading, you will need to manually restore those changes by using the Configuration utility or Traffic Management Shell (tmsh). Archiving /config/wa/pvsystem.conf.15.1.5.1 Archiving /config/wa/globalfragment.xml.15.1.5.1 Archiving /config/wa/pvsystem.dtd.15.1.5.1 Post-processing... usermod: no changes Reloading License and configuration - this may take a few minutes... Configuration loading error: high-config-load-failed For additional details, please see messages in /var/log/ltm WARNING: There were one or more errors detected during installation. Check the error messages and take the proper actions if needed. ERROR: UCS installation failed. Operation aborted. Unexpected Error: UCS loading process failed.