While challenging to find in the US, Suntour made the Perfect/ProCompe freewheels marked "Metric" to fit French threaded hubs. Finding a 30T, 32T, or 34T sprocket for this model is easy in that even the silver sprockets from the Winner, Alpha, and Accu Shift freewheel families will fit.

Your next option is to find Maillard Course or Atom 77 freewheels with French threads. Either had sprockets as large as 32T (IIRC they did not come in a larger tooth count).

Finally, finding a French threaded Regina or Atom 5 speed is a possibility. IIRC a 31T is the largest sprocket for these.