Im a left hander , ive allways used stick radios and ive never thought there was any problems.
As for steerwheel radios ive never fancied one as i felt that i could never control the wheel as precisely as a stick as i feel it doesnt feel natural , rather ironic as the steerwheels meant to resemble a car steering wheel.
To be honest its hard for me to find a problem as just like scissors for cutting paper i got used to it.
I remember i couldnt use left handed scissors as when i grew up i allways used normal scissors.
Erm not sure if i ve thrown any helpful light on the subject or just darkened it further?