Oh now that would be a fun version 2 challenge: have all the clocks in one household synchronize such that they're all early by the same amount at any given time.

Easy enough for wifi enabled ones: a UDP broadcast to discover other clocks on the network, then sync how you will.

For non-wifi-enabled clocks, perhaps something like a CH572 would do the trick: a $0.20 RISC-V microcontroller with BLE support that all the clocks in the same vicinity could use to talk to each other.

You could really mess with your neighbors if they had the same clocks and you were within range...