I've got an old Pug mixte that I'm trying to put together for someone at the office. It has Mafac center-pull calipers. She wants drop bars on it and I'm trying to avoid the regular Dia-Compe/Shimano/Weinmann turkey lever option and instead have some top bar levers in addition to the regular brake levers. Not sure if the center-pulls are an option for this. Anyone have any photos of how I can do that with or without center-pulls?

I don't have pics but in theory you should be able to use "interuptor" type levers on the drop bar tops with CP calipers. The "compression" of the housing that makes these work should not matter where the termination stop is: either on the (sidepull) caliper arm or on a (centerpull) hanger, AFAIK.
The limiting thing is that it might get awfully crowded in the cockpit: most of the time these are used on CX bikes with canti brakes and pretty wide bars, more room between levers and brakes than what you'd typically find on a mixte.

Cyclocross style "in-line" levers might be just what you're looking for. The Park Tools tech website shows how they're installed, but not connected to center- pulls, though it's the same installation of brake line once you get past the 2nd lever. Not exactly c&v, but they work pretty well if required. Hope this helps!

edit: beaten! darn these sausage fingers and tiny phone keyboard.

You're probably going to have a very short cable run between the interrupter and front brake cable hanger if the stem isn't really high.

Guidonnet levers may be a good option.

The only thing that I can think of that might be difficult is the short housing bend between the interrupter lever and the headset-mounted barrel adjuster.

edit: Looks like the Colonel beat me to the punch!

Might try a search in the SS/FG forum. Lot of them run interrupter levers; may be some with centerpull brakes.