Change LDAP-Integration UID value

It’s an active directory!

So it turns out that we are going to switch to a new domain soon, meaning that the ObjectGUIDs of all the users will change. And I’m guessing that, because of the changed ObjectGUID, new users will be created and all the tickets will be lost/inaccessible for the users.
So I’m hoping that I can modify the system to use the samaccountname instead of the GUID.

Is that possible? And if so, how?

I’ve set up the Zammad-System recently and removed our old Helpdesk-System, so there is not really a way back.