Actually, instead of mechanical linkages, I was thinking of a block and tackle system with multi-part purchase to gain mechanical advantage.....
--- we really could use a tongue-in-cheek smilie ---
Well, I have never
seen such a set up employed as part of a steering system on any modern boat, other than as part of a connection of a windvane to a wheel... Probably, for good reason... :-)
The desire to inject and configure needlessly complex solutions to problems that shouldn't exist to begin with, never ceases to amaze... :-)
That tiller can easily be shortened considerably... Keep in mind, any tillerpilot that might be used on that boat, will likely attach to the tiller at a point only 18 inches forward of the rudder post...