[Zope] Can Zope use a Different Python?

Hi. We've got Zope 2.2.2 installed on a Linux box. We want to be able to use the full-up python that's on the box instead of the python interpreter that comes with Zope for playing with External Methods. Is there any way to circumvent Zope's python in this way? If not, what's the easiest way to extend Zope to be able to use our non-Zope python? Alternatively, we're plagued by import and attribute errors when accessing the External Methods. Will simply moving (or linking?) all the pieces (whatever.py, __init__.py, etc.) into a subdirectory of "Shared" fix the problem? Thanks in advance for your help. -GMP