I wanted to go that route but I was told clearly by them that in order to do a solemn declaration the PR card needs to be issued by the office which they haven't.Have you tried doing a solemn declaration ?
Pr card processing times are very slow right now but waiting more than 1 year it’s insane.. I have no words I am really sorry!
https://www.canada.ca/en/immigratio...d-never-received-permanent-resident-card.html