TATW is not in development any longer, so someone creating a submod with it for you, or, more reasonable, to change it yourself, is the only solutions to your opinion about what TATW should change.
It's simply to edit the export_description_units-file, in the data-folder.
Go to the units cost entry, looking like this:
Code:
stat_cost 0, 560, 150, 65, 50, 560, 4, 140
Change the third number, here marked in red, that's the sum for upkeep.
You can release the edited EDU as a submod after that, might be others who want the same thing (while I think many would dread more stack spam) as you do
In my memory, TATW currently use a system where the units (give or take) have 40% of their recruitment-cost as upkeep-cost.