Yes you could use those as Canadians. Change the helmets to Mk III (or even the ones they have will suffice) just remember the Canadian Battledress was what is described as a bronze green. Here's a Pic of a Queens Own on D Day I did. If you want you can PM me and I can describe how I got the colour
Sorry little off topic but just showing how this kit can have variety.
Also I do believe the Black Watch of Canada actually used Pipers in Battle I could be wrong.
Cheers
Ray