Hi. I know this is late and I don't know if you are still interested. The connection of Beauvais to Pleau would be like this in my family.
George Pleau married my grandmother Elizabeth LaVigne
Her parents were Mary Ashlaw/Asselin and Joseph LaVigne.
Mary's mother was Zoe Beauvais who married John Asselin
Our Beauvais descends from Joseph Octave Beauvais
If you are interested in more detail you can reach me at firstname.lastname@example.org