If each Framework of Kyngchaos is in the PATH, it is easy. Every framework has a Unix folder, for compiling things like  pyproj or geos python wherever you want, even in a private Python environment (I've never had a problem) 

The only problem is that Gdal python is in the Gdal Framework. But in site-packages there a file gdal.pth

gdal.pth file: 

    import sys; sys.path.insert(0,'/Library/Frameworks/GDAL.framework/Versions/1.7/Python/site-packages')

if you do not want to compile it yourself, copy this file in your isolated python virtualenv