It is highly unlikely that another developer will make a place in their VC to allow you to add the CS Weather Radar to the VC.

It is hard to explain how the gauges are added in the VC if you don't have any knowledge of making add-on aircraft for FS.
I have noticed that it has become quite common to model the gauges as a part of the VC, so they are "built in". This makes it impossible to add it to the VC.

I think you will have to accept that it will be a 2D gauge for all but Captain Sim aircraft.

Mark