Change scene to polar azimuthal equal area

Is there a clean way to add a new projection and corresponding scene mode? For many projections I feel it would be possible to use the 2D scene mode but I was looking to do a polar azimuthal equal area as seen here in D3 documentation:

http://bl.ocks.org/mbostock/4364903

Apologies if this has been asked before I could not find an exact match in a search of the existing threads

These should be a good starting point:

https://github.com/AnalyticalGraphicsInc/cesium/blob/master/Source/Core/GeographicProjection.js

https://github.com/AnalyticalGraphicsInc/cesium/blob/master/Source/Core/WebMercatorProjection.js

Patrick