Nikon is, by far, our best option for map reduction. He is the best qualified to perform these mods.
You are right, now that I consider all the "spliced" map objects. It would be quite a task to reconfigure each object and shrink it's proportions, while aligning each object's collision lines. (We may get lucky, on some objects, in that shrinking them may lead to less individual pieces...)
Still willing to help, in any way necessary...
(Nikon had some unfinished maps that were never published, perhaps he still has them somewhere, floating around a database... Might be good starts for fresh maps)