Well, seeing as how K is the name of the actual platform, you have to realize that there were other cars built on this same platform, such as the Chrysler LeBaron and the Dodge 400. So if we are going to use "K" as a classification method, wouldn't it be appropriate to apply it to all K-cars so it won't, as you said, look so sloppy?

Also, I don't know about putting the name of the platform as part of the model name. But I don't know what others may think.