Can i break down site magic with sites offline?

Hello-

I set up a site magic VPN network last week for some temporary connectivity for an event. The event has passed and the other 2 UDMs used for this configuration are offline and not likely to come online anytime soon. Can I somehow break down the site magic for the 1 UDM that is still online (my main site?) Just trying to clean things up. I have a feeling at least one of the 2 other offline UDMs will end up doing a factory reset rather than ever coming back online the way it was. Thanks!