Hi
If you have an Exchange 2003 Environment, you should be able to get it working without any need for publishing with ISA.
There is a concept called "Proxy" which, get the requests directly from the OWA frontend and routes the request trough to EV (without the need for ISA publishing)
So, all of those technotes you describe are not applicable.
(They ARE applicable when you have OWA 2007, tough!)
Cheers
Michel