Q: I am looking for lever that behaves as an analog joystick would. Is there such a thing?
A: Short answer: not exactly, or rather, not readily available. The Seimitsu LS-64 behaves as an analog joystick, but it's very scarce and hard to come by. Since analog controls use potentiometers, they don't share very many similarities with traditional joystick levers. It's usually only that you see analog controls supported in commercial arcade sticks, due to being tied to a PCB.