With reference to my post immediately above, this went better than expected.
On our less than two hours late CZ, I talked to the conductor (or AC) out of Reno, explained the situation, and since he had no way to sell us on to EMY, he just OK'd staying on to EMY. We were looking at a less than an hour late arrival (excellent by this month's CZ performance) until we got stabbed by a ship at Suisun Bay. Tipped our SCA extra for the inconvenience.
Returning out of Jack London Square (OKJ), first went to the sleeper, talked to the SCA who said the room was ready. Before we could even board, the conductor came along scanning tickets so explained to her as well, she said OK, took both tickets, and we were off. Again, tipped the SCA extra (although she said it made things a little easier for her since it reduced her SAC boarding number from 17 to 15 - we'd be in bed by SAC and two less people to deal with at midnight was less work for her).
Interesting thing was there another passenger in the car that was giving them a problem since she apparently boarded early without even a coach ticket for the additional distance (don't know if she was also an official SAC connection but don't recall seeing her on the CZ). Having the transportation without the accommodations made it OK since we were entitled to be on the CS, just a matter of determining where on the CS.
A few other comments:
Definitely picked the right day for this. CZ was, as I said, only 1+ hours late. Pervious day was 4+ late and the next day's was 12+ late (but still would have made the connection to a 3+ hour late CS). CS was early into OKJ and was never more than 15 minutes late anywhere, early into PDX, and early into SEA.
PPC was surprisingly uncrowded with meal space going begging for lunch and dinner. We asked about reservations as soon as we boarded at OKJ and were first on the list for both meals. Unsold dinner Day 1 lamb was available for dinner Day 2. Other than breakfast in the diner, we never made it further back than the PPC the entire time on the CS.
On both trains, dining car crews were "aggressive" in soliciting business from Coach passengers (unlike some comments I've seen here about crews that try to discourage Coach business). On the CZ, despite announcing four seating times for dinner both days, they continued to work off the waiting list into what amounted to a fifth seating.
Fun tidbit: having your son text you a picture of the ugly view at EWR (airport) while waiting out a connection and responding with a 30 minute old picture of Donner Lake.