I am in the same situation. SO here is what I decided to do after all the research online & googling...
Post ITA we can still remove spouse/dependent's work experience (non-Canadian) and mention them in Personal history as it carries "0" point in the profile (which can be seen in the ITA also). So as long as the changes do not impact the score we are good to go. Also, it would be good to mention about the same in the letter of explanation as to why we removed dependent's non-Canadian work experience and put them in personal history section.
Refer this :
** This is my personal opinion and approach. Please do your part of the research before yo proceed. All the best!