It would probably be something like this considering most of the time the Camera ID is set to P1
Will switch back and forth between Y and Player 1's Camera ID with desired button. No idea if this will work. Probably doesn't.
NTSC-U
2834XXXX YYYYZZZZ
C2679a0c 00000002
3800000Y 9803009C
8803009C 00000000
CC000000 000000000
C2679a0c 00000002
38000000 9803009C
8803009C 00000000
E0000000 80008000
Will switch back and forth between Y and Player 1's Camera ID with desired button. No idea if this will work. Probably doesn't.
NTSC-U
2834XXXX YYYYZZZZ
C2679a0c 00000002
3800000Y 9803009C
8803009C 00000000
CC000000 000000000
C2679a0c 00000002
38000000 9803009C
8803009C 00000000
E0000000 80008000