It's not that hard and long to learn French to get B2, especially if you have already learned one other language. B2 is quite an intermediate level and language test is not about language proficiency, just practice and be attentive.
You need to max out your score to CLB 10, you won't get any additional points for a higher score.
Try to speak and write naturally, based on your personal experience without any templates and you will get 10s easily.
French has always been beneficial for EE so learn it, it's not a gamble at all. You will get extra points anyway. Besides, it would be very helpful to you in Canada for sure.
Two options:
1. You can raise a webform and send a LOE.
2. If you are sure that will get a new ITA soon, then you can withdraw and apply again then, it's up to you.
Just to be safe and avoid any misrepresentation.