Thanks, Bianchigirl. The touring levers look like they will probably suit my purpose. Thanks!
I will post photos of the bike when I'm finished with it on the mixte thread. I've been loving looking at other peoples' mixtes for inspiration. They really are elegant bikes! I might have to occasionally give my commuter bike a rest and ride the Puch instead!
Now, I'm going to try to apply some of my professional knowledge to fixing the damaged head badge (I am a book and paper conservator, and fix tears and scrapes all day long). This sort of thing is falls far more in my comfort zone than changing out brake levers!