Wireless Intellisync Via Access Point, Is it possible? Options

[madrak]

I want to sync my 5500 running OZ 3.5.2 to a Windows XP desktop running Outlook via Intellisync 1.43. The 5500 is already networked via a wifi card and router.

Router: 192.168.2.1
Desktop: 192.168.2.2
Zaurus: 192.168.2.4

The problem seems to be that there are only two Communication Options for the desktop Intellisync software: USB or serial. Neither will allow me to specify the correct address for my Zaurus, they instead give me an error:
"Please change USB IP address on Zaurus to 192.168.3.201"

I've read through all the threads which relate to this, and I haven't seen any solutions that fit my problem. They all seem to require that access to the Z be through a wifi card on the desktop, rather than a router.

Any ideas? I'm a bit of a networking n00b, Is there a way in XP to trick the system into substiting one outbound IP for another? Or perhaps the intellisync software can be hacked to get around the error message? Or am I missing something obvious...

Thanks,