samba - Jan 2008 - samba proxy - can it be done?

I am trying to build an embedded samba appliance that will work as a VPN 
endpoint for a remote server.

I have no control over the IP and routing assigned to the appliance, or 
the computers on its subnet.

I've set up wins forwarding on the appliance so I can see the remote 
server in My networks on the client PCs, but (not surprisingly ) I 
cannot connect to it as the windows clients have no route to the subnet 
at the remote endpoint.

Is there some magic bullet proxy that I can use to "forward" the 
connection from the remote samba server to the appliance?

Both the appliance and the remote are running samba 3.0.26a.

Thanks,

--Yan