Hi John,
You can use the Duralite regulators. You will see one side pull the battery down a lot faster than the other though because of the mis-match of the regulators. You will essentially be running on one regulator on light loads and the other will kick in at higher loads, how high depends on how badly they are mis-matched. I need to ask one thing though since you will be running on one regulator a lot of the time, what size plane is this and is the wire on the regulator 22ga? If you have 22ga wire and you have a 40% plane than I would be a bit worried about the wiring. 22ga is just not big enough on a 40% plane.