If they are not co-opearting with you on this matter. My advice is keep the things as it is and dont ask agian for Rukhsati. When they will see the objection letter with their own naked eyes then YES infect they will request you like a queen to come PK and have the rukhsati done because letter will clearly say's provide the proof in 45 days OR else provide future plan like if you want to do rukhsati 3 months down the road.
Ofcourse when he read this line "Not satisfying the requirments may result in refusal your application" he will reliaze that he want to go Canada then they will behave and will listen you. :
But good news is I was also Nikah wedding applicants recently perform rukhsati after getting objection and my wife is comming tomorrow as she got visa it took us 20.5 months.