The information I have about Ducharme of St-Joseph comes from T.W. Denommé's book, «Our French Canadian Ancestry in Huron County». I did not made on-site researches.
Denomme talks about Marie Papillon (not Papineau) as being the wife of Joseph Ducharme. He also gives all her ancestry up to the first Papillon in Québec. Obviously, he made a mistake, if documents calls this family Papineau.
I have a few informations on these Ducharme, but it's far from complete.