A's out. Still no backdoor Bs.
On another note, I recently had Crew Tracking tell me I had to accept 2 hour duty extension without any choice, it was a contractual obligation. They changed their tune a bit when pressed, but then said it would be a fitness for duty issue if I declined and I'd have to talk to CP. And of course no one even contacted us, or mentioned the flight was delayed, until I noticed things were taking us an hour over our "max duty" printed on the rotation.
That's not how I understood all the changes and FAA interpretations.
All the back and forth here, as well as this event with company, convinces me that without a lawyer on the phone, you can't really be sure what your obligations or limits are in the middle of an IROP. I was absolutely flat out told I had no choice in the matter, and then pushed veeeerry strongly.