I did not find a previous marriage for Francois. I look dunker Magnan, as well as under Champagne and under Magnan Champagne but nothing shows up.
I tried to read the marriage record for Francois and Marie Ursula but it is just too hard to decipher. I wanted to see if it mentioned him as a widower or not.
Do you have the marriage for their son Francois and Elisabeth Allard? I can give it to you if you need it. It shows that both his parents are deceased at the time of his marriage = Francois is listed as Champagne.