Probably worth comparing some torque plots of CDL vs AXX before getting into cam swaps. The biggest influence on the torque curve comes from turbo sizing, so the cams might only net you a comparatively small gain for the hassle and expense.
And history has taught me that mixing and matching different bits of VW / Audi engines can bite you in the bum if you're not careful, so if it were me, I'd throw an entire CDL lump in and benefit from all the other improvements at the same time.
