I understand it being an older game, but as far as I am aware this does have a working campaign map editor... is there any reason Shogun 2 was not explored, or decided against if it has been?
Given it's an earlier version of the engine, I don't see why animations couldn't be ported over or recreated?
Of course, you'd struggle with the settlements... but Ancient Empires team have managed to import Rome 2 settlements into Attila, perhaps there is the potential to do something similar so that there are more 'medieval' type cities for the Middle Earth style?
Thanks,
Edit: apologies, saw another thread about this that is similar after posting.