I've made some headway.
I've got the CH Peds to take over rudder control but they only work in toe brake mode - i.e., if I push the left pedal forward, I get left rudder...if I depress the left pedal, I get nothing.
What I did was select rudder under the AH Controls, then select the Sidewinder and then select "none" under the joystick input option window ---that disables the rudder input from the Sidewinder "twisty".
Next, I went back to AH Controls, selected rudders, highlighted the CH Peds and finally assigned them the "Z" axis.
Final question: Can I modify what I now have so that rudders are activated by stepping down on the pedals, rather than pushing them forward? Hey, I'm lazy