First part is correct! Don't need Language and Model. Don't seem to hurt either.
I don't know the CDA for Rogers, but you can find out doing the magic sequence >*<<*<* or with a2uploader's Identify, it should match the CDA in the custom files download section on this site.
It's certainly worth a try using an xml with that CDA and SEUS to REbrand. It's simple to do and quick. If Rogers is anything like AT&T, most likely it won't work. Report back if it works or not! Otherwise, you'll need a functional combo of MAIN, FS, and custom files. By "functional," I mean you can use SEUS to do further upgrades.
Unbrand has nothing to do with unlock. You either have to pay to unlock or find a free way which I have not seen, or ask Rogers to give you the unlock code. AT&T would. Report back if you find a free way to unlock. :)