[bitfolk] ZFS help sought

My own stupid fault for blindly following tutorials in the dim and distant past (2019) I guess and not then "backing that up" with learning exactly what it was you just did... I had a very small "ZFS infrastructure" set up. Small VM on a XenServer install; worked beautifully. USB disk that housed the XenServer install died, no more metadata/config, but all the VHDs were safely stored on external NFS disks. "Burned" a new USB on newer XCP-ng, started building new VMs. Nothing lost but time... But... When it comes to the ZFS volumes I find myself with 6 VHDs for one "mirrored pair", and I don't entirely know how to "attach" them to see the content/figure out which two are the current pair. I have the VM these ZFS VHDs belong to reinstated (bless Linux and /etc/hostname), but my novice ZFS skills ran out long ago. Is there a "simple" way to RO mount an individual zpool member (from a pair) and see what's on it? I'm happy enough going one VHD at a time if it's possible... Kind regards Murray Crane