Thanks to the sharp eyes of Liz and Ken Ellison of the Greater Vernon Museum & Archives the mysterious curlers of Long (Kalamalka) Lake have been identified. Liz contacted the Lake Country Museum and Archives with these identifications:
Curlers left to right: Walter Rea, Henry Irvine, Charlie Moore, and Rev. A. V. (Arthur Vandeleur) Despard.
Thanks also go out to Oyama pioneer Arnold Trewhitt who remembers that the brooms used were actual curling brooms, not household brooms as was presumed on the initial blog post.