If you have a look at page 16 of the Manual (which is free and can be had here:
http://www.flight-replicas.com/NorthStar_Home.htm ), you'll see that there is provision for using the existing VC radar screens in the military model with 3rd-party gauges. An invisible gauge poly is in place there over the existing radar screens, and so a 3rd party gauge radar can be placed in the scope using the panel.cfg, with any other knobs and panels being accessed through a 2D pop-up panel. The screen is round, so you may lose data if it's tucked into the corners, but you'd still have the 'big picture'.
(The DC-4 is still in development, and has a long way to go, but plans are to have both original and modern cockpit arrangements.)
Mike