You and I are challenged by similar systems; I have 8 machines that are absolutely identical
except... they have tuning values and histories that are unique per machine and cannot be over-written.
They are also heavily documented and change-regulated, so if I make a change to any one of them, I go around an import the routine, or do online edits. It's especially time-consuming in my case because one set of machines are not networked together because of (overblown) customer security concerns.
If the controllers are really identical, you can Store an image onto an SD card, configured for 'Load On Powerup', then just carry it around to each machine and do a power cycle.
I haven't taken a very close look at it, but the Rockwell
NAT network device might be applicable to your system.
Oh, and the Service Tickets thing at RA is down 'until further notice'; there's a security issue with the database vendor and they've shut it off. Calling or e-mailing gets quick responses, so don't wait for the online access part to come back up.