We have 3 hosts 2k8r2 in a cluster with a storage works server

Im looking at moving them over to a 2k12r2 cluster but I dont have the servers expect one but not enough memory

The only thing I can think of is to make this server I have which had vmm on into a 2k12r2 and uncluster 1 of the 3 hosts and enable iscsi to a nas box and export the vms and then import them into the new cluster on the new 2k12r2 server but only export the least important ones

Any thoughts