There are so many grad students and postdocs on here, have you thought to have one of them ask one of THEIR professors? This assumes the university(ies) doesn't prohibit "side projects" for professors.
If we were already in Lausanne, I'd ask my wife to ask her PI...
[When I first read the title, thought you were a professor in need of a teaching assistant. Around these parts, I think we usually refer to this as "proctoring".]