That dip is for cocktail only so player 2 will flip.
Cool mods, I hadn't seen that before.
You could flip the tube or flip the yoke (easier). Check the yoke connection to the chassis. I have seen some that have been cut to flip the 2 halves. If not you can cut it in the middle so you have 2 2 pin connectors instead of 1 4 pin. Then flip them, pins 1&2 switch and 3&4 switch and that will flip the image. - Barry