Did you ever get an answer to this?
What I have found on Family Search Website, is that Etienne (1711) Leger's brother, Jean-Baptiste's (1725) grandson, Jean-Baptiste (1784-1873) married Lisette Louise Bercier Forcier (1/2 Native), daughter of Alexis Bercier (1772-1840) + Josephte Saulteux (or Saulteuse) (1767-1853) who was full Native. Her parents were Augustin B. Saulteux (1760) + Marguerite (1767-1843) who were full Native.
I too would like to now if the Etienne line married any Metis women.
