This would be a really great feature to have implemented. I'm working on a setup right now that has many existing non UP supported printers that we want to use with UP.
I'm still playing around with the best options but I'm thinking the best options will be to have two print connectors on the network with the printers and register each printer twice, once from each connector, and do something like name the redundant set as Printer X (backup) or similar. It might be tidier to not share the redundant printer(s) and manually share the backups in the case of the main connector going down.
It would be nice if UP could recognize that the printer being shared from both connectors was the same and treat it as the same device in Entra so if one connector were to go down, from a user perspective, nothing would change.