I'd like a dumb phone again, but no KaiOS. My only problem with the phone in the OP is the display. I need to keep my contacts and that display looks like ass for trying to do anything but dial manually like a landline. I'd still like to have caller ID, voicemail, call history, etc.

It doesn't really need to be on the same circuit, but I think most of my family would rather just have walkie-talkies built-in to our phones.