Just my opinion.... Years ago (early 50's) when I was a kid on the farm my dad had two 8N Fords. Dad said the only thing that they were able to do was "git the cows" and rake hay with an old three bar hay rake. They didn't have a whole lot of power and were geared quite high.
To be successful with a tiller, the tiller would have to be small (very), soil would have to be light and tilled shallow. No live power would add to the mix. The gear splitter would definately help for you to pull this feat off.
Remember, just my opinion. Good luck!!!