Can you specify which reduction you're using?
I don't have access to CAD atm, but I think the only one that would present that issue is the 12:84 version.
The only remedy I can think of, if you're absolutely sold on using THAT gearbox, is to use larger wheels, a different reduction, or to not direct drive (though it wouldn't really be a WCD anymore...)
Otherwise, using a different gearbox is probably the best way to get around this.
As far as 1 speed transmissions go, the
AndyMark 3 CIM Toughbox might be a good replacement, as would this year's KOP gearboxes. (3 CIM drive is probably a bit much for a t-shirt shooter anyways...) Just note that you'll probably want the long hex output shaft.
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