I thought this adding more buttons for little bit more. I think this will be the best solution:
- make a copy of that metal plate where joystick and buttons are(this cause why damage the original).
- in the new metal plate move the first joystick far left, then 6 buttons and second joystick and 6 buttons(6buttons for CPS2 fight games)
- the start buttons go to front of the plate
i think cuttin metal, drilling and painting is semi easy but bending the metal plate in the same shape than the original is the difficult part