I think I can accomplish this with wget, but not directly:

1. Download the single file.
2. Figure out what wget called the file (should be only one text file in the directory structure)
3. Tell wget to do a full mirror of the file
4. link index.html to the file found in step #2

Obviously, this wouldn't be unique to wget -- you could use the logic with anything that can get all of the dependencies.

Update: bah ... you probably can't just symlink it, as if it has relative links it'll crap out ... you might have to then re-adjust the directory structure (there's a call to wget to get it to reduce the number of directories deep it goes ... you could figure out what to pass to wget in step #2, I guess)