I did it once before.
Just add/copy the entire python 26 folder from (C:\python26 )
into the App/gimp folder. rename it to just python
Now you need the python folder from the lib/gimp/2.0 folder in the installed Gimp-2.6.11
Copy that to the \App\gimp\lib\gimp\2.0 folder in your portable version.
copy the pygimp.interp and pygimp.env files from the installed gimp-2.6.11 ...
Copy those two files to their respective folders.
Now re-edit the pygimp.interp file to this
python=\python\pythonw.exe
/usr/bin/python=\python\pythonw.exe
:Python:E::py::python:
Now add all the python files in the C:\Program Files\Gimp-2.0\lib\gimp\2.0\plug-ins folder into your portable plugin folder so you have pyconsole.
Been a while but i believe that is how it is done.
Let me know if that works.
I am trying it again now.