How many NFS datastoes do you have? How big are your NFS datastores? and How many VMs do you have per datastore? I ask because the other way to approach this with your constraints is shut down VM on datastore, unregister the VMs from inventory, unmount the datastore, and remount with fqdn and reregister the VMs again and power-on your VMs and you should be in business. But of course this requires some downtime.
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