I've wanted an e-paper laptop ever since I saw a Kindle ad in 2008. I'm also interested in ultra low power computing (solar charging, daylight readable, months of battery life, offline-first, mostly text...). So your list has a lot of overlap with mine!

Such a thing doesn't seem to have been invented yet. The remarkable might come close (or that weird typewriter like thing?) but I haven't been able to justify any of those purchases yet...

I'm not 100% sure about e-paper (the lag may actually be a feature reducing addictiveness), I'm also amenable to those transflective Sharp LCDs! (Though I think they're a bit too small for a daily driver.)