To make thing simple you could just set the ip address of you empeg to be in the same range as that of the win2k box. It's not "nice", but the cable connection will usually not allow anymore then the one address it hands out via dhcp to reach through it, so you should be fine even if it is a "public" ip address.
An interesting idea. How does a PC like that normally talk to a fellow subscriber with an IP on the same subnet? My cable modem gives me an IP and says its on a class C subnet, but I'm sure it would take a route packets addressed to other machines on the same subnet as my IP (proxy ARP?)

The next choice would be to set up a second ip address to the nic in the win2k box, this one within the same range as the private one the empeg is using. Not using win2k myself so I don't know how / if you can, xp and linux neither have any problems with it though.
On Win2K, if you have DHCP enabled, the option to add another IP to the same interface is disabled. Linux lets you have DHCP and static IPs on the same interface, not sure what Windows' problem is.
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--The Amigo