Valiant efforts but I'm not sure I see a huge benefit here, at least not for most people who just fire these vintage things up for old games or reading recipes Grandma typed up 30 years ago. Every 6~11 years the calendar repeats, so just figure out what year to set to sync the date and don't worry about it because, unless you're a huge stickler for accurate created/modified dates on files or rely on the date for something (automated backups, for example) or you're running an Internet-enabled machine that checks date/time on certs, it won't matter. I don't do anything like that on a Classic Mac, so telling the system that today is January 30, 2022, 2011, 2005, or 1994 is all the same to me; the system's happy because it thinks it has a valid date set, and I'm happy since the clock still says it's a Sunday.
Honestly the bulk of my classic Mac files are dated August 1956 or whatever the default is because I just don't set it most of the time (I don't usually replace PRAM batteries and I can't be bothered to set the date every time I power up a machine). It'll make digital forensics challenging for someone if nothing else.