Upgrade OS on ZFS file server

I need to upgrade the OS of my ZFS disk server from CentOS 7 to Rocky Linux 9. I am currently running ZFS 2.0.7, and if I'm correct Rocky Linux 9 uses 2.3. My tentative plan is to use the AlmaLinux Elevate scripts to perform the migration to Rocky Linux 8 and then upgrade to Rocky Linux 9, as explained here. The OS resides in a dedicate SSD.

Since the server size is quite big (24 x 16 TB disks in ZRAID2 configuration) I have no backup possibility. Data loss is not an option, so I'm worried about possible troubles, e.g.:

1. is there any chance that upgrading the OS would result in pool corruption / data loss?
2. should I expect issues due to the upgrade of the ZFS version?
3. is the linked upgrade procedure robust? Could it be more safe to simply do a fresh install of Rocky 9 and reconfigure everything?

Thanks in advance for any advice.