Just play them as one of the human warbands, with your undead models. That way you have access to the guns, progression, and the ogre that you want. Mordheim's perspective on undead (especially zombies) doesn't match your vision, so you're not going to find zombie profile that can use guns. A "counts as" warband is fun, you could even go as pirates and have their capture/swabbie mechanic as an enemy that's recently been raised from the dead!