[Zope] Xron and PCGI

Is there any way to make Xron and PCGI working together? At the moment I've got several happy servers running on PCGI but I would now like to install and use Xron on one of them. Unfortunately, after much fiddling about we are unable to get the Xron tasks to fire. We've investigated the sources and it looks like the type of threading Xron relies on is not used when running from PCGI, but I'm a python/threads novice so I could be wrong. My next lead is to try and get Zope running as a web server on some port other than 80 in addition to having stuff routed through pcgi in the hopes that Xron will then start working. Is that possible? Steve