Off the top of my head, I imagine there's a way to build the pizza oven with a firebox below, vertical style, and have a smoker cooking chamber beside it like an offset design. Then it'd just be a matter of using exhaust dampers on both cookers so you can route the heat into one or the other.
Or you could have two cookers for simplicity sake.
~ Scott ~
Blue Weber Performer + Craycort CI • Brick Red Weber One-Touch Platinum • Weber 26.75 Kettle • Akorn Kamado • ET 732 • Record-crushing ORANGE Thermapen • UDS In Progress