Can't do that in Canada eh!
1- NM must have a connector that's designed for use with such cable and shall be used to secure the cable in place adequately.[CEC 12-3022(3)]
2- Close the openings through which the conductors pass in such a manner that any remaining opening will not permit entrance of a test rod 6.75mm in diameter[12-3022(e)]
Also, don't you have to keep the main conductors seperate from the other conductors in that type of panel? You know, the ones with the little wall attached to the cover that seperates them?