If you really want advice, it's "don't bother"
One could ask "why" you see the need?
If you really deperate and able, then technically it is surely possible. However, the whole rear seat rudder system will need to be beefed up to work properly, and then be supported well enough to add pivots for brakes etc. The assembly will grow from ~2" vertical to nearer 10" [foot brace / pivot, rudder pedal, brake pedal] all to be contained in an area encroaching on the front seaters arm / hand space.
That's before we now consider the rear seater is still probably short of engine controls except throttle, all switches, all instruments etc.