No, you will need to do it on a per-host basis.
I really recommend doing it one by one, no hurry, and checking all the networking before doing the next move. Example: after migrating the vmkernel interfaces, check on an ssh connection to the host if it can vmkping the NAS. Before moving all VMs on the host to the std switch, move only one and check if the VM networking keeps working. Doing this will avoid errors and downtime.