I'm not as smart as I wish I were; I just couldn't think of a better way to refer to that general area of idea-space, especially given that the local audience consists primarily of LW-readers who likely already know the terms.

Well, I'm also not as smart as I wish I were, and I don't know what you mean by "Bayesian rationalist", or "optimized in a Bayesian sense", but they do look like combinations of local buzz words. If you were tying to use them to make an argument, then I didn't get it.

if a truck hits me tomorrow, there's not much more I can do to prepare other than have already signed up for cryo.

If a truck hits you tomorrow and you die, then you will most likely suffer massive brain damage before any cryopreservation procedure can be attempted, hence I wouldn't worry about it if I were you.