Is it possible to write to/from python converts with Cython?

Is it possible to write to/from python converts with Cython?

Is it possible to write to-python and from-python converters using Cython
like it is possible for boost.python?
Edit (on comment request, with more details on why we'd like this):
We currently have code that is written in C++ that is bound to Python via
boost.python. In this C++ code, we deal with Blitz::Array<>'s. In our
current abstraction scheme, code in Python uses NumPy's ndarrays, while
code in C++ uses Blitz::Arrays<>. We have written a bridge that can
convert from numpy.ndarray's to Blitz::Array<>'s and vice-versa, in a
quite transparent manner. This bridge can also avoid copying in some
circumstances, what is bonus.
Issues with this approach:
Portability: compiling for different versions of Python requires that
Boost.Python is compiled for each version of Python;
Documentability: including Python docstrings in C++ code is not very nice.
It has discouraged our developers to implement nice looking documentation.
It often looks patching and incomplete;
Build speed: compiling boost.python templates can be quite slow. We do
this in parallel using CMake to speed-up, but then we would like to create
a stock Python egg with our project. As you are probably aware
setuptools/distutils and CMake don't mix very well so we have some sort of
patchy way to do things in this domain.
So, given the prospect of Cython, I thought we would give it a try and
find a less hacky way to solve all these issues. We already have a
code-base that relies on numpy.ndarray and I'd like to leverage from that
as much as possible, with minimal writing and maximum reuse of our C++
code base. Therefore, my question.