Further browsing and searching led me here:

http://www.zope.org/Members/lstaffor/ZClientMethod (thanks Loren!)

<shameless-plug> or try out KebasData at http://www.zope.org/Members/kedai/KebasData it's not meant to be a be used to connect to access, but as a temporary measure until you find such solution </shameless-plug> or, you could install zope in the windoze box, connect to access with odbc, and use xmlrpc from the linux box..