Depends on how this ignition switch work in you simulator.
If allow assign a key for each postion (L - R - Both - Start):
Wire L, R, Both and Start in 4 buttons input in Arduino (MMjoy2).
i tried to wire each point direct to the inputs in arduino (mmjoy2) with diode each. then the common point in ground.
nothing happens. no response in mmjoy2 app
im a little bit confuse in direct input in mmjoy2. because i always see instruction for matrix button. actually all my toggle switch is working fine in matrix setup.