@reallyanonymous I do not suggest this. You can get your remedical done and simultaneously inform IRCC that you are getting married in December. Wait for them to add your spouse to the application. We recently had a case here, wherein the applicant got married after receiving the CoPR. She informed IRCC about her marriage but did not receive any reply. Since her medical was expiring, she decided to do a soft landing with the CoPR issued and informed the immigration officer at Toronto airport that she got married and had informed IRCC. The authorities seized her documents immediately and asked her to appear at a specific date at the IRCC office. We don't know what is happening right now with her case.
IRCC is very clear that if there is a material change in your circumstances then you have to inform them. They will have to do background checks for your spouse and clear him as well before you land.
Alternatively, the only thing that you can do is land there before you get married i.e. if you get the CoPR before December. Then sponsor your husband later. Although I feel that adding your husband now will be a better idea as it will be faster.