Best practice: chnage zfs raid1 (ssd) to raid10(sas)

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Hi,

I recently got a lot of 10k SAS disk.
One of my cluster nodes (3 node cluster 4.2) uses SSD as a mirror.
For me somehow waste of resources.
So my idea is to change that raid1 to raid10 (node has 4 slots).

Can I manage it somehow with zfs tools or is it safer ans easier to just remove that node from cluster.
And reinstall proxmox on that 4 SAS disks?

2) Question is there an option for raid10? I can't remember ;-)

Thanks