The only "new" avenue of research I could find is:
Eric Jonasson, Canadian Veterans of the War of 1812, Wheatfield Press, Winnipeg, 1981; pg 58:
Pvt. Charles St. Antoine, living in 1875 at Faribault Co., Minn.
In 1815, Charles was supposedly living in Ontario. He was of Gen Brock's Company.
If something else occurs to me, I'll let you know.
My St. Antoine line drove me nuts for years and finally broke when I found the brother of my great-great-grandmother.