Did you happen to look at Philippe Divine's F'40 art mod or the one that Warhorse did for F'40?
The only other art mods I can think of besides the first three I mentioned is the Old Banshee Art mod that uses the old TalonSoft 3D graphics. The download link for it is found toward the bottom of the page.
http://old-banshee.com/downloads.php
The last mod being MapMod.
Sorry I can't help you out about your "newer graphics" question as all of the PzC titles I own are the "older" HPS versions.
You mentioned "The rivers are quite distinguishable until the "y" filter has been turned on".
What do you mean by the "y" filter?