How to make router DR without using IP OSPF PRIORITY or without changing the IP address of the loopback

 router ospf 1
   router-id 223.255.255.255

Make sure that you do not use 255.x.x.x, because when you will need to redistribute between OSPF and BGP, the router-id must be the same. BGP does not accept router-ids higher than: 223.255.255.255