I’m working towards something like that. I’m hoping to ultimately drop the smartphone altogether, and I’ve set my current phone’s end of life (2027ish?) as the goal.
I think the other thing that’s necessary to keep the same sense of connectedness is a device to receive notifications, and I have an open source smartwatch I want to program for that. I’ve been working on a notification server too (kind of like Gotify), but at the moment it’s a work in progress