That's a good point. If they do have a problem with your breaking the silence, you could always relocated to the front steps or perhaps even the roof, where a reading is likely to be more tolerated.

I think that many people would definitely be in the way in the Procope though, and possibly also in the Conciergerie and the Carnavalet, depending on the number of visitors on the day you go. The other two options have the potential to be loud, though they should have enough space--and I think the Palais Royal would be more appropriate for a reading of something by Desmoulins than by Robespierre.