Holy crap, Ken, what a ride!
Thanks for sharing your experience. It's good for me to know that someone with your loads of experience doesn't feel like there's nothing left to learn.
I have a emergency list as well, and go over stuff with my buddy periodically. We'll be having a conversation about nothing dive-related whatsoever, and I'll suddenly say, "You're down at 100' and suddenly realize your reg is free-flowing. What do you do?" This is much more fun when we're in a group of non-divers, who look at me like I've lost my mind.
Before each dive trip, we go to the pool and practice everything from basic mask removal, sharing air, etc. to just finding stuff and retrieving it out of our BC's, inflating the safety sausage, hand signals, etc. We've both just purchased SMB's that can be inflated underwater, so that will be added to the list of skills to practice.
Hopefully, we'll never have to get ourselves out of a life-threatening jam and we'll both be able to perform our emergency skills as practiced and survive.
We need to dive more, also, to keep our skills up. That means diving in the cold Oregon muck, but I'm willing to do it. Besides, there's always something to see and photograph, right?
You're a great writer, by the way!