I'm looking for a better solution, because I want absolute realism.
Unfortunately, in the absence of "force-feedback" rudder pedals, I
don't know what else to try.

Rig up some real rudder pedals (the right distance apart), with springs.
Connect them via bungee cords or other springs to the CH pedals. If
you do it right, you'll be able to press either (real) rudder pedal
independently, but have that motion transferred to the CH in the
differential way it needs. The force fed back to your legs would come
from the (big) springs, and the force from the (wimpy) CH pedals would
be transferred to the (real) pedals via the (only needs to be wimpy)
bungee cords.

Jose
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