Arcade Stick/Alternative Controller (accessibility)

Hello there. I am searching for a good Arcade controller/stick for my old Sega Genesis / Mega Drive. It can be an old model or a new one, as long as the joystick doesn’t offer too much resistance. I have a little daughter with a hand disability (left hand) and the old controllers are a bit difficult to handle, because she doesn’t have the thumb. If anyone here has another suggestion of controllers too, I am open to hear. Thanks in advance for the help.