You cannot avoid adding your spouse. It doesn't matter they accompany you or not. The moment you get married and have the marriage certificate, you need to report it to IRCC. Better marry and add your spouse, so that you both get your COPR's at the same time (you are looking at 3-4 months extra processing times). If you add her later (after your COPR and completed your landing), you will be looking at a 1 year of processing time for yoru spouse. Also according to the Mandate letter, a Temp Visa may be created for spouses of PR's. But not sure if they will ever create that.