...a tall 6cyl engine...
Now, why would ya wanna do that...? Let us know what you're using and the expected gains, sounds very interesting and certainly different.
I do think though that with a small tweak of the mechanism it'd be easy enough to do.
I attempted to modify the original mechanism of the Monte in order to make it work with only one wiper when I did my experiment many years ago. Trying to get the right sweep of the screen by shortening/lengthening the mechanism etc drove me damn near insane... I'd be very interested in your results.
Andrew.