Some people do this switch, it's not that uncommon. It all comes down to your GPA and ECs (for McGill & out of province schools). You can apply to all the French Schools + McGill, should you wanna stay in Quebec. If you'd like to broaden your horizons then you might wanna write the MCAT ... but again whether you'll be competitive out of province highlight depends on your GPA and ECs. Most schools value research experience - so it might be something to look into, if you haven't already.
There's a section in the forum dedicated to the Quebec med schools. That's most likely where you'll be considered most competitive. I also think you might wanna check out other posts made about this topic - you'll probably find more information over there.