[Input Syntax] Have a button act as a "toggle"?

[helpimafish2001]

So I wanted to invert the controls of the FLUDD cam in Mario Sunshine and I couldn't find a way to make it so the inversion only takes effect when I'm in that mode. Would it be possible to make the FLUDD cam button (I have it mapped to the right stick click) act as a "toggle" using Input Syntax? (i.e. the left stick acts as normal until the right stick is pressed, which inverts it and then turns it back to normal when pressed again)
Thanks in advance.