After setting up the baseline nvOC installation, you could simply create a new image of the partitions (or entire disk), and use it to flash new disks. For that, you would need to boot from a different drive, as the disk you're going to image shouldn't be mounted. I personally like GParted Live and PartedMagic, as they are loaded with several utilities for that, but you could just use the "dd" utility that comes with every modern Linux basic installation.

So: boot GParted Live from USB stick; have the disk you are going to create the image from ready; have a disk where to save the image file ready; use a partition/disk cloning utility (or "dd") to create the image; use that image to flash new disks. Note that depending on your hard drive sizes, ideally you should create images with only the used space (some utilities allow that), as it doesn't make much sense to create a (say) 250 GB image with only 10 GB used.

Finally, I don't think you'd need to change anything on the newly-flashed nvOC disks, as it automatically adjusts the worker name based on the IP address (but of course you can), and the Xorg reconfiguration should be done automatically too.