http://planetelderscrolls.gamespy.com/View.php?view=Mods.Detail&id=9226 includes a pluggin Left-Hand_Guards.esp, which adds a left-handed guard in a few of the cities around Morrowind. This is intended as a modding resource, please feel free to use as you wish.
All animation and shields in this mod are Bethesda's. I have mirrored the animation and changed a few notes to make it left-handed. The shields too, have been mirrored to better fit the right arm.
This is still very much a work in progress and may later include a first person base anim for the player.
Here are a couple of old pics:
http://i22.photobucket.com/albums/b342/rx31/LeftHanded.jpg
http://i22.photobucket.com/albums/b342/rx31/GuardsAction.jpg
http://i22.photobucket.com/albums/b342/rx31/ScreenShot17.jpg
Known Bugs
Strangely, the game engine only uses the torch sequence from the original base anim and not from any of these. This may not be correctable.
Please feel free to report any issues or other bugs you may find as well as comments and suggestions.
Best regards,
RX31