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In EU using DCF-77 probably would be more practical. I am sure that similar radio-s are in US too.

On my end I wish I had the knowledge to make a similar clock but synced to GPS time, allowing to set the timezone and DST using DIP switches on the back.

It could work anywhere a GPS signal can be locked, no need for an Internet connection.

Synchronized wall clocks are a thing

In the US you can get clocks that auto-set by tuning into the NIST radio signal WWVB. They come in both digital and analog, with various designs. They don’t need Internet; just some regular batteries.

hell, my wrist watch does that, and it's solar powered. thanks, Citizen.