I would do this but as the newest version of WC3 has no custom campaign functionality would people even be able to run it? I've had people report that some of the levels don't work on the older versions of the game as well.
As I said the campaign progress will still save between the levels so even though there is no UI element available to play it as a campaign, the maps can still be loaded and progress will be saved between them
As soon as blizzard add custom campaign functionality back to WC3, this will be the very first thing I do!