Okay, so from the thread linked in the last post, it's clear that setting up yum is a one-liner. I checked production and we have yum-arch installed.
Also in the other thread, Jade asked about integrating the repositories with file-storage. It sounds possible, and would give us RSS support, but would be a bit of extra work transferring all of the files in. We might be able to facilitate that with WebDav, assuming you can serve a yum repository from a different machine than the one you ran yum-arch on. Is this true?