I havn't read your post. But I suppose the WW1 games are off with homework simulators and the boring afternoon simulators becuase none of them would make a very good video game. Just doesn't work.
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Would you like to send your men to their deaths on a very boring muddy landscape?
-Yes
-No
You selected no.
You have gained 0 territory.
Would you like to send your men to their deaths on a very boring muddy landscape?
-Yes
-No
You have selected yes.
You have gained 1 territory.
The enemy has attacked, you have lost 1 territory.
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Seem like a fun, tectically deep, and visually stunning game to you? It doesn't to me.
However, with a bit of imagination, they could maybe make something, like a fortification sim. Hear me out. Like stronghold, except instead of building a castle, you build a trench network, with different types of trenches, and different garrisons to occupy them. Eventually you have to withstand a wave of enemies or something. It could maybe be a cheap, short, downloadable game on steam.
Also:
http://uk.gamespot.com/pc/strategy/1914thegreatwar/index.html?om_act=convert&om_clk=gssimilargames&tag=similargames;title;1
http://uk.gamespot.com/pc/strategy/gunsofaugust/index.html?om_act=convert&om_clk=gssimilargames&tag=similargames;title;2
http://uk.gamespot.com/pc/strategy/worldwarone/index.html?om_act=convert&om_clk=gssimilargames&tag=similargames;title;5
http://uk.gamespot.com/pc/strategy/gunsofaugust/index.html?om_act=convert&om_clk=gssimilargames&tag=similargames;img;3