It does occur to me that the kind of advanced science that would be able to reverse cryo preservation might well be able to recreate that kind of ability, though, now that I've thought enough about it to spell it out.

I'd put a much higher probability on that kind of 'advanced science' than on cryonics working, FWIW. The key ingredients like BDNF are already loosely known, and we already know a lot of drugs (like piracetam) that have effects on BDNF.