I want a beautiful eink clock that gets its time from gps/gnss. It seems too much to have to collect a clock to wifi. Just turn it on and it should work.
This is what I’m working on right now. It lasts about 3 months on battery updating every minute, except every five at night. I’ve been meaning to switch to a word clock to make it last longer.
Depending on your trust of societal infrastructure, I got a DAB radio clock that sets time from the radio.
Indoor signal reception problems though
Indoor GPS reception is spotty, especially in urban / high-rise environments, so I don't think that's a realistically marketable product. Not unless you some have some window- or balcony-mounted probe, which would then require battery changes (although I suppose you could make it solar-powered).