Hi Jack, Drawables attached to GeoObjects are fully controlled by the Wikitude SDK and you can not manipulated there behaviour with another JS engine.
With our next release (end of August), you can define the matrices that we use internally to render objects. You would still need to pass the matrices from JS to native code so that it then can be injected with this new feature. So I guess it will not be fast enough since it was designed to directly calculate object position in native code.
Jack Lu