The Warlock has only one conversion. I removed the dagger from his right hand to achieve a casting pose.
My Witch actually has many more conversions than are immediately obvious. First, I sanded off any embellishments on the robes. Next, I cut out the staff which went from his left hand through his cloak. I then applied Ghoul arms and green stuff cloak sleeves. The head is an Empire Wizard head, but the hair has been removed and sanded down.