Have you guys seen this: http://morepypy.blogspot.com/2010/04/using-cpython-extension-modules-with.html ?

I wonder if it could be integrated with Jython to enable Jython to use CPython extension modules such as PIL and NumPy.

From an initial look, it seems to be an easier approach for us to integrate than IronClad would be, although I need to look deeper before I could tell for sure.