Why do you need such a device? To navigate using a VOR you only need to align a straight edge with the compas rose over the VOR to measure the Radial. Remember, Radials radiate FROM the VOR and will be a reciprocal of the Bearing TO the VOR
If you want to Plot a position using VORs you can either use the rose on the map or a Douglas Protractor with a rule or straight edge.
Plastic plotters are about as much use as plastic knives and forks.