PRTD or PR card is required to re enter Canada, but when you leave Canada your need passport only.Do you mean PRTD doc? That takes 21 days from Los Angeles and only after I'm there. So thats ruled out.
Here's what I'm gonna do:
1. Wait for PR Card till Aug 27th otherwise call CIC to see where it is;
2. Try to board the flight from SFO using only my TRV
3. Last resort is to change my flights to Buffalo and then drive to Niagara and cross the border using my CoPR.
So a 4th option can be:
You receive PR card before returning to Canada. Like if you have someone trustworthy who can get you the PR card (once it's been delivered from IRCC/CIC to your provided Canadian address) cross border before you come back.
This could work out the simplest way.