Not for OTAA. Assuming the devices have been deleted from Loriot, a new OTAA Join Request will only be handled by TTN, and then TTN will supply new session keys and a new DevAddr (with the proper prefix for the TTN network) in its Join Accept.
However, your problem is: how to make the devices initiate a new OTAA Join.
See also How can an operational node be triggered to join a different network? but that’s too late for existing devices.