I like this idea/option to swap records between two devices, looks like a good way forward. Obviously the warranty on the physical devices needs to be left with the devices, that makes sense to use, a bonus you’ve mentioned here is the ability to moved between models, wow that would be so good, so if a regional office had a Balance 310 and was replacing it with Balance ONE or a Balance 580, now that is going to be terrific. Doing this within the existing group makes a lot of sense too.
As to the two devices being both offline while it is done, would be interesting to test it when the new device is already powered up, as that would allow a replacement unit to be sent to site so as long as it has access to IC2, someone in a support role or at a NOC can then provision the unit remotely, reduces the need for a trained technician to be at site and that is going to be important with remote offices/locations.
Happy to Help,