swap pins for a black box cell

I am looking for an option for swap the pins for a black-box cell without extracting the black-box cell as a custom cell.

For example, my black-box cellname is ABC, and it has pin X, Y, P, N. I have to make P and N swappable, but X, Y not swappable. Is there anyway I can do it without define that blackbox cell as a custom device?

Thanks,

Qing