Thanks for your reply and explanation. I understand. Though it is still in the future, but in such cases, would you advice to wait for meeting the RO and then apply to renew PR card?Answer for the 2nd part that you think you already know.
You cannot and should not renewal your PR card until you meet our RO. If you renew without meeting RO, yes you can try to write a letter and explain but it's not the normal process and your application will likely go to some secondary review with your H&C justification. What we've seen is that could result in a very long processing time for the PR card (I saw a few saying that if they waited for the 2 years, they wouldn't still be waiting... ) and it may be refused. It could even triggered a review of your PR status. (no one reported that yet... as far as I've read here)