Interesting, and worthy of consideration. I helped Mike Richey to get the Jester replica ready for its first OSTAR, helping to sort the problem with an extremely bad run of cables forward to the whipstaff that made it almost unsteerable. If you have a clean run, it might be feasible.
Thinking aloud:
The tiller can act as a tiller, or as a "wheel with one spoke", depending on the arrangement of the quadrants. Personal preference comes in here.
The quadrants and lines are inside the boat, but the tiller must emerge in the cockpit (unlike Jester, where it was all inside). If the tiller quadrant is below the pivot, and the rudder quadrant is forward of the rudder shaft, the tiller would act like a tiller, not a one-spoke wheel, and the pivot point could be at cockpit sole level, which would give the least problems with waterproofing (rubber bellows?).
The tiller need not be vertical (whipstaff), but might be horizontal or inclined? The mechanism would be the same.