We're using an AAV for our island drain, but before I can attach it the pipe coming out of the slab is not vertical. How do I fix that?

Additional Information:

I haven't attempted to measure how far out of plumb it is, but I don't believe it's enough that even the smallest standard fitting will do the trick. I've considered either heat and bend or cut and install a flex coupling. The AAVs I've read about are looking for a five degree tolerance if I'm not mistaken.