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