XPiratez relies on OpenXCom Extended, and Soldier's Diaries depends on it's own executable, so it would be hard to mix the two. There was a merge done by.. fudge dragon, which was posted in the Soldier's Diaries thread, so that might work, but I'm not sure how up to date it is anymore with Extended and if any newer features would be missed. It is certainly not a maintained executable either..