This mod will make you famous. Famous I say!
..
Now that the flattery is done I do agree. This is a great idea. Please add all the maps you can find or perhaps setup a directory / text index.
The text index would contain the EQ2 reference to zone or some code identifying that (this part you guys would prepare) and then a filename supplied by the user. The user could then supply their own mapfiles (if there are directory or size limitations these could be spelled out in a README file).
Not sure if it's that simple but if it is that might be one way around having to try to track down and convert all these maps as well as having to constantly update with new expansions / etc.