You could always try hang gliding or paragliding. Neither have rudder pedals...
Seriously though, it would be worth trying the K-13 glider as Mary suggested, as its much more upright sitting position and the pedals can be moved towards the pilot quite a way.
A friend is trying to sell a Taylorcraft BC-12 1940s two seat aeroplane at the moment, and his main problem is that a lot of pilots these days are just too big to fit in it comfortably.