From the looks of the tires in your sig pic, I think the only way you will be able to rotate them is front to rear. You'll have to keep your left tires on your left side, and right tires on your right side since they're most likely directional.
If the far inside shoulder of the tire is worn, you can inflate them a little above factory specs so the bottoms will wear faster than the sides, although I wouldn't necessarily recommend this for a long period of time.
Why don't you get a camber kit? It seems like it'd be a wise investment to me.
*** If they're not directional tires, follow this rotation to help your wear pattern.
FL --> RR
FR --> RL
RL --> FL
RR --> FR