Um, actually when it appeared I wasn't going to get any help I started experimenting on how to do it myself. I discovered that Making files backwards compatible is actually quite easy.
Like I said, I wasn't interested in the doodads attached by the newer versions. I was primarily looking for the mesh.
So it turns out that using a file in a older version is as easy as opening the file in .txt format and cut/pasting the fields you're interested in. Just copy them out of the new version file, and paste them into an empty mdl file you make with the version you currently have. I just took the [MESH] and [patches], but there's no reason I couldn't have grabbed the groups and such as well. It's that simple.
I am not upgrading at this time because I am about to change address. I do not want to order the CD and have it show up at my old address after I've moved. I just wanted to get a head start looking at the basics.
But anyway, I figured I'd post the solution in case anyone came looking for it.