> It would be nice to have a method for GMarker, etc. that would return
> the underlying map (or null if the overlay has not been placed on a
> map yet).

But why?  If an overlay is on a map, you put it there, you know you
did it, and only need to remember that.
You might use a custom property to do that, something like
   marker = new Gmarker(....) ;
   mymap.addOverlay(marker) ;
   marker.parentMap = whatever ;

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