I agree with ScubaLawyer in that the ideal backplate is the VDH plate. It was specifically design for this purpose.
But, it will not hurt you to try it with the Scubapro Nighthawk. It is a back inflate and if it fits you properly, you should be able to adjust the tank down to a good position. You may need to add a crotch strap to hold it down.
The Nighthawk probably has only one tank strap and in the long run you will be better of with the VDH plate, but it will not hurt you to try at first.
On the other hand, the modern backplate is not suitable for a double hose. The plate is too tall and interferes with the regulator. Most of the modern plates are also bend in the center. That was specifically design for a set of double tanks. When this type of plate is used with a single tank, the tank is located too far from the diver. That distance is very detrimental to the performance of a double hose. The DH regulator needs to be a close to the diver as possible.
The VDH plate is intentionally flat and is not very thick. The cutout allows the can in some regulator to actually touch the diver back.
Buceador con escafandra autónoma clásica.