Best solution for me:
I created a new KVM/QEMU to setup a small NAS with separate Kernel 6.1 LTS and ZFS that directly access my external physical disks as pass-through disks via PCI without virtual.
- Host: Kernel 6.2 is now running on my PC without ZFS.
- Guest: Kernel 6.1 LTS is running on my KVM with ZFS on the same PC.
Both communicate via a local NFS share (Speed ~31Gb/s). NFS preserves all file permissions , Samba does not.